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saccade (n.)

1705, from French saccade "a jerk," from obsolete saquer "to shake, pull," dialectal variant of Old French sachier, ultimately from Latin saccus "sack" (see sack (n.1)). Related: Saccadic.

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Definitions of saccade from WordNet

saccade (n.)
a rapid, jerky movement of the eyes between positions of rest;
saccade (n.)
an abrupt spasmodic movement;
Synonyms: jerk / jerking / jolt
From wordnet.princeton.edu