Definition of "laryngeal"

At sight of it there commenced a series of laryngeal spasms, with clutchings at his throat, far more violent than any I had heretofore seen.

1871, S. G. Cook, “A Case of Hydrophobia”, in William A. Hammond, editor, The Journal of Psychological Medicine: Diseases of the Nervous System, Medical Jurisprudence and Anthropology‎, volume 5, page 83

The vowel-coloring effects of the IH laryngeals cannot be considered apart from the vowel-reducing effect of the IH stress accent […]

1940, J. Alexander Kerns, Benjamin Schwartz, “The Laryngeal Hypothesis and Indo-Hittite, Indo-European Vocalism”, in Journal of the American Oriental Society‎, volume 60, number 2, page 183

[…] it is not only different from Buck's in the linguistics (laryngeals have seen to that); it is very different in scope and aim.

1995, Andrew L. Sihler, New Comparative Grammar of Greek and Latin‎, New York: Oxford University Press, page viii

Finally, it should be noted that laryngeals not adjacent to syllabics were apparently deleted by three different rules.

2006, Donald Ringe, From Proto-Indo-European to Proto-Germanic (A Linguistic History of English; 1)‎, Oxford: Oxford University Press, page 15