From The Collaborative International Dictionary of English v.0.48:

Apteryx \Ap"te*ryx\, n. [Gr. 'a priv. + pte`ryx wing. Cf.
   Aptera.] (Zool.)
   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.
   [1913 Webster]
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