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Sinus Iridum
Si·nus I·rid·um [ snəss írridəm ]


noun 
Definition:
 
crater on Moon: a large half-crater on the Moon adjoining the northwestern side of Mare Imbrium. Its walled perimeter forms the Montes Jura and it is approximately 260 km (160 mi) in diameter.
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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