While looking through the 'back formation' words I found the term 'nonce' and thought it might be worthwhile to search in the etymology field:
> Found: 36 entries
> --------------------------------------------------------------------
> 
>   1. accentuality
>   2. beetle
>   3. bimetallic
>   4. blood-strange
>   5. branskate
>   6. bulling
>   7. canage
>   8. colp
>   9. compliment
>  10. cornu-cap'd
>  11. counter-order
>  12. cousiness
>  13. crab
>  14. darling
>  15. dearly
>  16. denounce
>  17. denounce
>  18. denouncement
>  19. emberlucock
>  20. enounce
>  21. fylfot
>  22. holimonth
>  23. humblesso
>  24. ist
>  25. liripipionated
>  26. misadventure
>  27. nonce
>  28. nunce
>  29. ought
>  30. patrollotism
>  31. progenerate
>  32. saunter
>  33. straint
>  34. transprose
>  35. trudgeon
>  36. vagulate
Realizing that I wasn't absolutely certain what the boundaries of 'nonce' might be, I did a lookup of the entry:
> 
> nonce
> 
> nonce1 no(hook)ns. Forms: 3 [to pan anes], Ormin naness, 4-5 nonis,
> 4-6 nones, nonys, nons, nonest (5 nownes, noones, -ys, 6 nonst(e,
> 6-7 nonse, 8-9 dial. noance; Sc. and north. 4 nanyse, 4-5 nanes, 5-6
> -is), 6- nonce. orig. in the ME. phrases to pan ane, *for pan ane,
> to pan anes, *for pan anes, the last of which was altered by wrong
> division (as in a newt for an ewt) to for pe nanes, nones, literally
> = for or with a view to the one (thing, occasion, etc.). The
> genitival form anes was substituted for the original dative ane
> probably by analogy with the synonymous pairs ane and anes, ene and
> enes = once. For the forms nonest, nonst, cf. onest, onst for ones,
> once amidst for amiddes.
> 
> 1.
> 
> for the nonce
> 
> for the nonce:
> 
> a. For the particular purpose; on purpose; expressly. Often with
> inf. or clause expressing the object or purpose. Obs. exc. dial.
> 
>    * C. 1200 Ormin 7160, & wel itt mihhte ben patt he Wass
>      gramm..All forr pe naness, forr patt he Swa wollde don hiss
>      lede To ben all pess te mare offdredd Off himm & off hiss e33e;
> 
>    * 1297 R. Glouc. (Rolls) 5795 He com & mette him in a wode & bed
>      him abyde, & he adde uor pe nones tueye suerdes bi is syde;
> 
>    * 1338 R. Brunne Chron. (1810) 108 Steuen com for pe nons, pis
>      lond to haf he pouht.
> 
>    * C. 1386 Chaucer Prol. 381 A Cook they hadde with hem for the
>      nones, To boille the chiknes with the mary-bones.
> 
>    * C. 1440 Promp. Parv. 173/2 For the nonys, idcirco, ex
>      proposito.
> 
>    * C. 1450 Merlin 420 For the dredde that theire beerdes sholde
>      growe she lete a-noynte her chynnes with certeyn oynementes
>      made for the nones.
> 
>    * 1533 More Answ. to poysoned Bk. Wks. 1055/1 Thys bread is bread
>      descending from heauen for the nones that whoso may eate and be
>      fedde of that, shall not perish by euerlasting death.
> 
>    * A. 1548 Hall Chron., Hen. VIII, 216 She withdrewe her into a
>      litle place made for the nones on the one side of the quere.
> 
>    * 1548 Udall, etc. Erasm. Par. John ii. 5-8 Jesus deferred ye
>      myracle for the nonest, because the lacke of wyne should be the
>      better perceiued of euery body.
> 
>    * 1596 Shaks. 1 Hen. IV, i. ii. 201, I haue Cases of Buckram for
>      the nonce, to immaske our noted outward garments.
> 
>    * 1600 Holland Livy xxiii. xxiii. 490 Trifling out the time for
>      the nonce and of purpose [orig. sedulo].
> 
>    * 1670 Lassels Voy. Italy ii. 128 They buryed her alive in a low
>      vault made for the nonce.
> 
>    * 1760-72 H. Brooke Fool of Qual. (1809) I. 80 The least
>      locomotive faculty, in the meanest reptile, must..be provided
>      with..nerves, tubes, reservoirs, levers, and pulleys, for the
>      nonce.
> 
>    * 1853 W. D. Cooper Sussex Gloss. (ed. 2), Nonce, purpose,
>      intent, design. `He did it for the nonce.' Still in frequent
>      use in S. and Hants.
> 
>    * 1887 Kentish Gloss.
> 
> b. In ME. poetry (and later, more or less archaically) used as a
> metrical tag or stop-gap, with no special meaning; frequently riming
> with bones and stones.
> 
>    * C. 1315 Shoreham Poems v. 233 Thare he fond flesch and blod myd
>      pe bones, An nou he gan to crye loude for pe nones: `My lord
>      ich abbe y-founde.'
> 
>    * 13.. Gaw. & Gr. Knt; 844 A hoge hapel for pe nonez, & of hyghe
>      elde;
> 
>    * 1375 Barbour Bruce x. 58 The folk off Lorne..tumlit on hym
>      stanys, Richt gret and hevy for the nanys.
> 
>    * 1390 Gower Conf. II. 102 A stille water for the nones Rennende
>      upon the smale stones.
> 
>    * C. 1400 Destr. Troy 1502 Of hir ffeturs & fairhed is ferly to
>      telle, Alse noble for pe nonyst as nature cold deuyse;
> 
>    * C. 1400 Ywaine & Gaw; 2051 The lyon hungerd for the nanes, Ful
>      fast he ete raw fless and banes.
> 
>    * C. 1440 Generydes 3289 His helme was wele ordeynyd for the
>      nonys, Right wele garnysshed with perle & precious stonys;
> 
>    * 1513 Douglas Æneis viii. i. 67 Eneas..hymself doun layd.. for
>      the nanis, And gave schort rest vnto his wery banis.
> 
>    * 1557 Tottel's Misc. (Arb.) 169 Behold my picture here well
>      portrayed for the nones, With hart consumed and fallyng
>      flesshe, lo here the very bones.
> 
>    * 1591 Spenser Vision Bellay vi, I saw her litle ones In wanton
>      dalliance the teate to crave, While she her neck wreath'd from
>      them for the nones.
> 
>    * A. 1635 Corbet Poems (1647) 50 Here for the nonce, Came Thomas
>      Jonce, In St. Jileses Church to lye.
> 
>    * 1832 L. Hunt Poems 289 A cup of good Corsican Does it at once;
>      Or a glass of old Spanish Is neat for the nonce.
> 
> c. For the occasion; hence (in modern use), for the time being;
> temporarily.
> 
>    * 1589 Puttenham Eng. Poesie ii. xvi. (Arb.) 143 If your word
>      polysillable would not sound pleasantly whole, ye should for
>      the nonce breake him.
> 
>    * 1672 Marvell Reh. Transp. i. 98 To make a Conscience fit for
>      the nonse, he sayes [etc.].
> 
>    * 1775 Wesley Wks. (1872) VII. 406 Do we not continually tell
>      lies for the nonce, without gaining thereby either profit or
>      pleasure?
> 
>    * 1819 Scott Ivanhoe xxvi, I fear..there is no one here that is
>      qualified to take upon him, for the nonce, this same character
>      of Father Confessor.
> 
>    * 1848 Dickens Dombey vi, Converting the parlour, for the nonce,
>      into a private tyring room.
> 
>    * 1859 Jephson Brittany iv. 42, I therefore made a virtue of
>      necessity, and was a good Catholic for the nonce.
> 
>    * 1888 Bryce Amer. Commw. iii. lvi. (1890) II. 376 They will take
>      the often more profitable course of fusing for the nonce with
>      one of the regular parties.
> 
> 2.
> 
> a.
> 
> to pan anes, o' the nonce
> 
> to pan ane(s, o' the nonce = 1 a.
> 
> with the nones
> 
> with the nones: on condition (that). Obs.
> 
>    * C. 1205 Lay. 17304 Tha pet word him com to pet Brutes wolden
>      per don, & comen to pan anes to fæchen pa stanes;
> 
>    * C. 1205 Lay. 21506 Mid spæren and mid græte wa3en to pan ane
>      icoren;
> 
>    * C. 1384 Chaucer H. Fame iii. 1009 And here I wol ensuren thee
>      With the nones that thou wolt do so, That [etc.].
> 
>    * C. 1385 Chaucer L.G.W. 1540 Hypsipyle, As wolde almighty god
>      that I had yive My blood and flesh, so that I mighte live, With
>      the nones that he hadde o-wher a wyf For his estat.
> 
>    * C. 1400 Gamelyn 206, I wold geve ten pound,..With the nones I
>      fand a man to handil him sore.
> 
>    * 1665 Cotton Poet. Wks. (1765) 116 She kept Sichæus' Bones In a
>      great Coffer made o' th' nonce;
> 
> b.
> 
> in the nonce
> 
> in the nonce: at that moment, at once.
> 
>    * C. 1475 Hunt. Hare 266 Y wold that..In the nownes ye had me the
>      coppe gene, For therof had Y nede.
> 
> 3.
> 
> for the very nonce
> 
> for the very nonce: for the express purpose.
> 
> at the very nonce
> 
> at the very nonce: at the very moment.
> 
>    * 1627 J. Carter Plain Expos. 55 When they fasted,..insteed of
>      disfiguring their lusts, they disfigured their faces, for the
>      very nonce; affecting rather the seeming then the substance of
>      sanctimony.
> 
>    * 1681 Hickeringill Black Non-Conf. iii. Wks. 1716 II. 36 If they
>      stray, thou art a good Shepherd, reduce them; thou are well
>      kept and paid for the very nonce.
> 
>    * 1705 Hickeringill Priest-cr. i. ibid. III. 4 So fitted and
>      accoutred by Providence for the very nonce.
> 
>    * 1855 Browning Childe Roland xxx, Fool, to be dozing at the very
>      nonce, After a life spent training for the sight!
> 
> 4. attrib.:
> 
> nonce-word
> 
> nonce-word, the term used in this Dictionary to describe a word
> which is apparently used only for the nonce (see vol. I, p. xxvii);
> similarly
> 
> nonce-use
> 
> nonce-use, etc.; similarly
> 
> nonce-borrowing
> 
> nonce-borrowing,
> 
> nonce-combination
> 
> -combination,
> 
> nonce-form
> 
> -form,
> 
> nonce-formation
> 
> -formation,
> 
> nonce-meaning
> 
> -meaning.
> 
>    * 1954 U. Weinreich in Saporta & Bastian Psycholinguistics (1961)
>      385/1 At the time of his utterance, it is a `nonce-borrowing'.
> 
>    * 1943 Amer. Speech XVIII. 301 A number of them..also meet the
>      condition of not being independent words used in some
>      nonce-combination.
> 
>    * 1962 H. A. Gleason in Householder & Saporta Problems in
>      Lexicography 88 A dictionary-maker need not include a
>      non-idiomatic nonce-form.
> 
>    * 1957 Archivum Linguisticum IX. 122 It clearly functions
>      morphemically as everyday nonce-formations testify.
> 
>    * 1943 C. L. Wrenn Word & Symbol (1967) 97 The most surprisingly
>      beautiful result of Spenser's experimenting in poetic language
>      is in the use..of the word Cheuisaunce, which may be described
>      as having acquired for special purpose what I would call a
>      nonce-meaning.
> 
>    * 1884 Nonce-wd. [see anotherness].
> 
>    * 1927 Englische Studien Nov. 99 If an alternative explanation
>      presents itself, topographical nonce-words ought to be avoided.
> 
>    * 1957 R. W. Zandvoort Handbk. Eng. Gram. i. ii. 43 Some of them
>      are nonce-words, i.e. spontaneous creations by a speaker or
>      writer, coined for the occasion.