hippus

hippus

[hip-uhs]
noun Medicine/Medical.
spasmodic contraction of the pupil of the eye.

Origin:
1675–85; < Neo-Latin < Greek híppos horse, complaint of the eye

Dictionary.com Unabridged

-hippus

variant of hippo- as final element of compounds: eohippus.

Origin:
< Latin < Greek -hippos

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

hippus hip·pus (hĭp'əs)
n.
Spasmodic, rhythmical dilation and constriction of the pupil, independent of illumination, convergence, or psychic stimuli.

The American Heritage® Stedman's Medical Dictionary
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