Bailly
v. κνέφαλον.
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LSJ
τό, wool torn off in carding or fulling cloth, flock, used for stuffing cushions or pillows; hence, cushion, pillow, E. Fr. 676, Cratin. 99, Eup. 228, Ar. Fr. 19, etc. (prob. in IG1². 330.22, cf. Demioprata ap. Poll. 10.39); κνάφαλλον, γνάφαλλον (cf. κνάπτω, γνάπτω) are freq. as vv. ll. ; γνάφαλλα, PCair. Zen. 298 (iii BC); Aeol. γνόφαλλον Alc. 34.6.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)