vermilion(noun, adjective, verb) adjective1. of a vivid red to reddish-orange colorSimilar word(s): chromatic, cinnabar, vermillion noun1. a variable color that is vivid red but sometimes with an orange tingeSimilar word(s): scarletDefinition categories: attribute, red, rednessSentences with vermilion as a noun:- vermilion colour: verb1. color vermilionDefinition categories: change, redden