Bailly
[ῡ] ou ὕννις, gén. εως, acc. ιν (ἡ) soc de charrue, coutre, PLUT. Rom. 11 ; BABR. 37, 2 ; ANTH. 6, 104 ; 7, 175, etc.
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LSJ
εως (ιος Hdn. Gr. 2.761), ἡ, ploughshare, PPetr. 2 p. 133 (iii BC), PCair. Zen. 782 (a).37 (iii BC), PStrassb. 118.15 (i AD), Corn. ND 28, Babr. 37.2, Plu. Rom. 11, Artem. 2.24, Gp. 2.2.3, Sm. 1 Ki. 13.20, PTeb. 406.19 (iii AD), PFlor. 134.3 (iii AD); also ὕννις, ὁ, Sch. Hes. Op. 425, Hsch. ; ὕννη, ἡ, Aesop. 98b. (Plu. 2.670a derives the word from ὗς, from the hog΄s nozzling and rooting.) [υ, AP 6.104 (Phil.), 7.175, 176 (both Antiphil.), 280 (Isid.), Babr. l.c., Hdn. Gr. l.c. ; Suid. is in error when he says τὸ δὲ υ μακρόν.]
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)