Abbott-Smith Manual Greek Lexicon
ἄζυμος (G106)
9 ἄζυμος , -ον ( ζύμη ), [in LXX for מָצָּה ; τὰ ἄ. (sc. λάγανα , cakes ) = הַמָצָּה ;] unleavened : ἡ ἑορτὴ τῶν ἄ. ( הַג הַמָצָּה ), the paschal feast (also called τὰ ἄ. , Mk 14:1 ), Lk 22:1 ; ἡμέρα τῶν ἄ. , Mt 26:17 , Mk 14:12 , Lk 22:7 ; ἡμέραι , Ac 12:3 20:6 . Fig., of Christians, free from corruption : I Co 5:7 ; exhorted to keep festival, ἐν ἀζύμοις (sc. ἄρτοις , λάγανοις , or, indefinitely, "unleavened elements"), I Co 5:8 (Cremer, 724).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain