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opt
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opt-in e-mail
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optic
optic axis
optic chiasma
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optic chiasma
op·tic chi·as·ma (plural op·tic chi·as·mas)


noun 
Definition:
 
area of brain: the X-shaped nerve tract beneath the brain where the optic nerves from each eye meet and that enables some of their constituent nerve fibers to cross sides
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