laryngismus

from WordNet (r) 3.0 (2006)

laryngismus
    n 1: laryngeal spasm caused by the sudden contraction of
         laryngeal muscles

from The Collaborative International Dictionary of English v.0.48

Laryngismus \Lar`yn*gis"mus\, n. [NL., fr. Gr. laryggismo`s a
   croaking. See {Larynx}.] (Med.)
   A spasmodic state of the glottis, giving rise to contraction
   or closure of the opening.
   [1913 Webster]