Ap·ter·al a.
  1. Zool. Apterous.
  2. Arch. Without lateral columns; -- applied to buildings which have no series of columns along their sides, but are either prostyle or amphiprostyle, and opposed to peripteral.
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  apteral
       adj 1: having columns at one or both ends but not along the sides
              [ant: peripteral]
       2: (of insects) without wings [syn: apterous]