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-opsy
opt
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opt-in e-mail
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optic
optic axis
optic chiasma
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optic axis
op·tic ax·is (plural op·tic ax·es)


noun 
Definition:
 
line going through lens: a line passing through a lens, a curved mirror, or a crystal along which light can travel without undergoing double refraction
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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