musk 
(mŭsk)
(mŭsk)n.
1.
a. A greasy secretion with a powerful odor, produced in a glandular sac in the abdomen of a male musk deer and used in traditional medicines and formerly in the manufacture of perfumes.
b. A similar secretion produced by certain other animals, such as an otter or civet.
c. A synthetic chemical resembling natural musk in odor or use.
2.
a. The odor of musk.
b. An odor similar to musk.
[Middle English, from Old French musc, from Late Latin muscus, from Greek moskhos, from Persian mušk, probably from Sanskrit muṣkaḥ, testicle; see mūs- in the Appendix of Indo-European roots.]