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Webster 1913 Edition

Noun.

A disease of horses, characterized by difficult breathing, with heaving of the flank, wheezing, flatulency, and a peculiar cough; broken wind.

Noun.

heevz. A disease of horses, characterized by difficult and laborious respiration.

heaves

plural of heave
(colloquial) A period of retching.
I have the dry heaves, I rather just throw up and get it over with.
A disease of horses characterized by coughing and difficult breathing.

heaves