noun

1. a substance with a strong, penetrating odor, obtained from a small sac (musk bag) under the skin of the abdomen in the male musk deer: used as the basis of numerous perfumes
2. a similar substance secreted by certain other animals, as the alligator or musk ox
3. the odor of any of these substances, now often created synthetically
4. any of several plants having a musky scent

Etymology: OFr musc < LL muscus < Gr moschos < Pers mušk, musk < Sans muṣka, testicle, dim. of mus, mouse