The Collaborative International Dictionary of English v.0.48:

Glottal \Glot"tal\, a.
   Of or pertaining to, or produced by, the glottis; glottic.
   [1913 Webster]

   Glottal catch, an effect produced upon the breath or voice
      by a sudden opening or closing of the glotts. --Sweet.
      Glottic

WordNet (r) 3.0 (2006):

glottal catch
    n 1: a stop consonant articulated by releasing pressure at the
         glottis; as in the sudden onset of a vowel [syn: glottal
         stop, glottal plosive, glottal catch]