Crescent/ˈkresnt/ Definition 1 of 4Pro Tip 1/3Moon Phases Crescent often describes the moon's shape when partially visible. We gazed at the crescent moon, imagining faces in its contours. Pro Tip 2/3Not Always Lunar Objects that mimic the moon's form may also be called crescent. She cut the melon into crescent pieces for the fruit salad. Pro Tip 3/3Waxing or Waning A crescent can denote both the growing and diminishing phases of the moon. The waxing crescent signaled the beginning of the lunar cycle.