Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
σπάδοντι castrato LXX.Gen.37.36
σπάδοντασ castrati LXX.Isa.39.7

Liddell-Scott-Jones

σπάδων (spadōn) a castrato G:N-M

σπάδων [], ωνος

(and οντος [LXX+1st c.AD+], : (σπάω):— eunuch, [LXX+2nd c.BC+]. Hence σπᾰδωνισμός, , castration, [Refs]

LSJ Scripture Refs: LXX.Gen.37.36LXX.Isa.39.7