Source : Webster's Revised Unabridged Dictionary (1913)

Apteral \Ap"ter*al\, a.
   1. (Zo["o]l.) 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}. --R. Cyc.

Source : WordNet®

apteral
     adj 1: having columns at one or both ends but not along the sides
            [ant: {peripteral}]
     2: (of insects) without wings [syn: {apterous}]