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opsonin
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optical double star
op·ti·cal dou·ble star (plural op·ti·cal dou·ble stars)


noun 
Definition:
 
2 stars appearing close together: a pair of stars that appear to lie close together as viewed from Earth but are actually a long way apart, lying along the same line of sight
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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