WordReference Random House Unabridged Dictionary of American English © 2017
Ar•is•tar•chus  (ar′ə stärkəs),USA pronunciation n. 
  1. Biographicalof Samos. late 3rd century b.c., Greek astronomer.
  2. Biographicalof Samothrace. c216–144 b.c., Greek philologist and critic.
  3. an extremely bright crater in the second quadrant of the face of the moon: about 29 miles (47 km) in diameter from crest to crest.

'Aristarchus' also found in these entries:
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