Aristarchus

[ ar-uh-stahr-kuh s ]
/ ˌær əˈstɑr kəs /

noun

of Samos.late 3rd century b.c., Greek astronomer.
of Samothrace.c216–144 b.c., Greek philologist and critic.
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.

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British Dictionary definitions for aristarchus

Aristarchus
/ (ˌærɪˈstɑːkəs) /

noun

a crater in the NE quadrant of the moon, having a diameter of about 37 kilometres, which is the brightest formation on the moon
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012