cosmeceuticalscos‧me‧ceu‧ti‧cals /ˌkɒzməˈsjuːtɪkəlz $ ˌkɑːzməˈsuː-/ noun [plural] technicalbeauty creams that make your skin softer or more attractive. Cosmeceuticals contain chemicals that some people claim actually improve your skin by making it young again.