The Collaborative International Dictionary
Thelytokous
Thelytokous \The*lyt"o*kous\ (th[-e]*l[i^]t"[-o]*k[u^]s), a. [Gr. qh^lys female + to`kos a bringing forth.] (Zo["o]l.) Producing females only; -- said of certain female insects.
Wiktionary
thelytokous
a. That produces female offspring (only)