hippus

[ hip-uhs ]

/ ˈhɪp əs /

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noun Medicine/Medical.

spasmodic contraction of the pupil of the eye.

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Origin of hippus

1675–85; <New Latin <Greek híppos horse, complaint of the eye

-hippus

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

<Latin <Greek -hippos

What may have been the original of the term Hippa, and Hippus, will be matter of future disquisition.
A New System; or, an Analysis of Antient Mythology. Volume II. (of VI.)|Jacob Bryant
Hippus had never been a model of manly beauty, but to-day he was positively uncanny.
Debit and Credit|Gustav Freytag
And though I am not quite sure how Hippus will take it, I am inclined to believe it will perplex him.
Debit and Credit|Gustav Freytag
As soon as Hippus felt the cold on his boot, he stood still and cried out, "Water!"
Debit and Credit|Gustav Freytag

Changing his mode of attack, he suddenly asked, "Do you know a certain Hippus?"
Debit and Credit|Gustav Freytag

hippus

[ hĭp′əs ]

Spasmodic, rhythmical dilation and constriction of the pupil, independent of illumination, convergence, or psychic stimuli.