What does apteryx mean?
The definition of apteryx
Ap”te*ryx, n.
Etym: [Gr. Aptera.] (Zoöl.)

A genus of New Zealand birds about the size of a hen, with only short rudiments of wings, armed with a claw and without a tail; the kiwi. It is allied to the gigantic extinct moas of the same country. Five species are known.