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Definition of Hippus
1. a clonic spasm of the iris [n -ES]
Medical Definition of Hippus
1. Intermittent pupillary dilation and constriction, independent of illumination, convergence, or psychic stimuli. Origin: G. Hippos, horse, from a fancied suggestion of galloping movements Respiratory hippus, dilation of the pupils occurring during forced, voluntary inspiration, and contraction during expiration. (05 Mar 2000)
Lexicographical Neighbors of Hippus
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