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Latin word *retina comes from Latin teneo, Latin re-
teneo (Latin)
(of laws) I am binding on; bind, hold, obligate. (reflexive) I keep back, remain, stay, hold position. I comprise, contain, include, hold. I hold fast, restrain, detain, check, control; bind, fetter. I hold, have; grasp. I insist, uphold. I know, grasp, understand, conceive. I possess, occupy, control. I reach, attain; gain, acquire, obtain. I recollect, retain knowledge of, remember, bear [...]
re- (Latin)
Again; prefix added to various words to indicate an action being done again, or like the other usages indicated above under English.. Back, backwards.
retineo (Latin)
I hold fast, maintain, preserve, protect, guard, retain.. I hold in check, repress, check, stop, stay.. I keep or hold back, detain, restrain, retain, confine, contain; delay.
*retina (Latin)
(Vulgar Latin) rein.