saccade

saccade

[sa-kahd, suh-]
noun
1.
the act of checking a horse quickly with a single strong pull of the reins.
2.
Ophthalmology. the series of small, jerky movements of the eyes when changing focus from one point to another.

Origin:
1720–30; < French saccade jerk, jolt, orig., movement of a horseman who abruptly pulls the reins, equivalent to Middle French saqu(er) to pull violently (N dialectal variant of Old French sachier, ultimately derivative of sac sack1, hence presumably with sense “withdraw from a sack”) + -ade -ade1

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World English Dictionary
saccade (səˈkɑːd, -ˈkeɪd)
 
n
1.  the movement of the eye when it makes a sudden change of fixation, as in reading
2.  a sudden check given to a horse
 
[C18: from French: a jerk on the reins of a horse]

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American Heritage
Medical Dictionary

saccade sac·cade (sā-käd', sə-)
n.
A rapid intermittent eye movement, as that which occurs when the eyes fix on one point after another in the visual field.


sac·cad'ic (-kä'dĭk) adj.
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