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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]