I. ˌrü-bə-ˈfā-shənt adjective
Etymology: Latin rubefacient-, rubefaciens, present participle of rubefacere to make red, from rubeus reddish + facere to make — more at ruby , do
Date: 1804
: causing redness (as of the skin)
II. noun
Date: 1805
: a substance for external application that produces redness of the skin