Dictionary entry

δεκατέσσαρες

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament

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).†