ru ‧ by /ˈruːbi/ BrE AmE noun ( plural rubies )
[ Date: 1300-1400 ; Language: Old French ; Origin: rubis , rubi , from Latin rubeus 'reddish' ]
1 . [countable] a red jewel
2 . ( also ˌruby ˈred ) [uncountable] a dark red colour
—ruby adjective
ru ‧ by /ˈruːbi/ BrE AmE noun ( plural rubies )
[ Date: 1300-1400 ; Language: Old French ; Origin: rubis , rubi , from Latin rubeus 'reddish' ]
1 . [countable] a red jewel
2 . ( also ˌruby ˈred ) [uncountable] a dark red colour
—ruby adjective
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012