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
    adj 1: of or relating to or produced by the glottis; "glottal
           stops"

Moby Thesaurus II by Grady Ward, 1.0:

125 Moby Thesaurus words for "glottal":
   accented, allophone, alveolar, apical, apico-alveolar,
   apico-dental, articulated, articulation, aspiration, assimilated,
   assimilation, back, barytone, bilabial, broad, cacuminal, central,
   cerebral, check, checked, close, consonant, consonantal,
   continuant, dental, diphthong, dissimilated, dissimilation, dorsal,
   epenthetic vowel, explosive, flat, front, glide, glossal,
   glottalization, guttural, hard, heavy, high, intonated, labial,
   labialization, labiodental, labiovelar, laryngeal, lateral, lax,
   light, lingual, liquid, low, manner of articulation, mid,
   modification, monophthong, monophthongal, morphophoneme, mute,
   muted, narrow, nasal, nasalized, occlusive, open, oxytone, palatal,
   palatalized, parasitic vowel, peak, pharyngeal, pharyngealization,
   pharyngealized, phone, phoneme, phonemic, phonetic, phonic, pitch,
   pitched, plosive, posttonic, prothetic vowel, retroflex, rounded,
   segmental phoneme, semivowel, soft, sonant, sonority, speech sound,
   stop, stopped, stressed, strong, surd, syllabic, syllabic nucleus,
   syllabic peak, syllable, tense, thick, throaty, tonal, tonic,
   transition sound, triphthong, twangy, unaccented, unrounded,
   unstressed, velar, vocable, vocalic, vocoid, voice, voiced,
   voiced sound, voiceless, voiceless sound, voicing, vowel,
   vowellike, weak, wide