LSJ
τό, = πυριάτη, Philippid. 10 (as cited by Poll. 6.54, but τοὺς πυριέφθας Ath. 14.658d cod. A, and Hsch. has πυρὶ ἔφθαι (sic)· τὸ πρῶτον γάλα, and πυριεφθής as gloss on ξηροπυρίτας, s.v. ψηροπυρίτας), cf. Gal. 6.694, Poll. 1.248, Eust. 1626.6 (ubi vulg. πύρεφθον), Phot., etc.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)