LSJ
ὁ, first milk after the birth, whether of women or cattle (beestings), Cratin. 142, Pherecr. 108.19, Ar. V. 710, Pax 1150, Fr. 318.5, Fr. 16 D. [υ Ar., but πυον Emp. (v. supr.); on the accent cf. Hdn. Gr. 1.111.]
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
[ῡ], ἡ, = πυρός, v.l. bei Hom. Od. 18.368.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)