Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
σπερματισθή conceive LXX.Lev.12.2
σπερματίζον was seeding LXX.Exod.9.31

Liddell-Scott-Jones

σπερματίζω (spermatizō) to conceive G:V

σπερματίζω-ᾰτίζω,

sow, τι εἰς γῆν [Refs 2nd c.AD+]:—passive, of a woman, conceive, become pregnant, [LXX]

__2 ἐξ Ἀπόλλωνος αὐτὸν σ. make him son of [Refs 4th c.BC+]
__II intransitive, of plants, to be in seed, [LXX]

LSJ Scripture Refs: LXX.Lev.12.2LXX.Exod.9.31