Decrescendo :: Decrescendo (a. & adv.) With decreasing volume of sound; -- a direction to performers, either written upon the staff (abbreviated Dec., or Decresc.), or indicated by the sign..
Decrescent :: Decrescent (a.) Becoming less by gradual diminution; decreasing; as, a decrescent moon..
Decrescent :: Decrescent (n.) A crescent with the horns directed towards the sinister.