ruby-red ru·by·red uncommon adjective 1. having any of numerous bright or strong colors reminiscent of the color of blood or cherries or tomatoes or rubies Synonymsredreddishruddyblood-redcarminecerisecherrycherry-redcrimsonrubyscarlet Similarchromatic WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.