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opposition
opposition research
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oppress
oppressive
opprobrium
oppugn
ops
opsin
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opsonic index
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optic cup
op·tic cup (plural op·tic cups)


noun 
Definition:
 
embryonic depression that becomes retina: a two-walled depression in a human embryo that develops into the retina
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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