Breadcrumb Home > Dictionary > Index R Cite Rupes Altai: Meaning and Definition of Find definitions for: Ru•pes Al•tai Pronunciation: (r'pēz al'tī). [key] a mountain range in the fourth quadrant of the face of the moon: about 315 miles (507 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Rupert rupestrine TrendingHere are the facts and trivia that people are buzzing about. January 2021 Current Events: US News The Holocaust (1933–1945) Chinese New Year History, Meaning, and Celebrations Noble Titles and Ranks in a Monarchy The 5 Best Air Purifiers of 2020 Inaugural Trivia Related Content Daily Word Quiz: subrosa Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language