ap·ter·ous /ˈæptərəs/
  (a.)無翅的,無翼的
  Ap·ter·ous a.
  1. Zool. Destitute of wings; apteral; as, apterous insects.
  2. Bot. Destitute of winglike membranous expansions, as a stem or petiole; -- opposed to alate.
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  apterous
       adj : (of insects) without wings [syn: apteral]