Abbott-Smith Manual Greek Lexicon
δεκατέσσαρες (G1180)
5 † δεκατέσσαρες , -ων, oἱ, αἱ, -α, τά , [in LXX: Ge 31:41 , To 8:19 , al. ;] = cl. τεσσαρεσκαίδεκα , more freq. in later Gk. than the older form and in MGr. (for thirteen and upwards) universal, fourteen : Mt 1:17 , II Co 12:2 , Ga 2:1 (cf. τεσσαρεσκαιδέκατος ).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain