"inclining to redness," c. 1500, from Middle French rubicond (14c.), or directly from Latin rubicundus, from rubere "to be red," from ruber "red" (from PIE root *reudh- "red, ruddy"). Related: Rubicundity.
Santa's rubicund cheeks
rube
Rube Goldberg
rubella
Rubenesque
Rubicon
rubicund
Rubik's Cube
ruble
rubric
ruby
ruche