The Collaborative International Dictionary of English v.0.48:

Wide-angle \Wide"-an`gle\, a. (Photog. & Optics)
   Having or covering an angle wider than the ordinary; --
   applied to certain lenses of relatively short focus. Lenses
   for ordinary purposes have an angle of 50[deg] or less.
   Wide-angle lenses may cover as much as 100[deg] and are
   useful for photographing at short range, but the pictures
   appear distorted.
   [Webster 1913 Suppl.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

wide-angle
    adj 1: of or relating to a fisheye lens [syn: fisheye, wide-
           angle]