Musk meaning : A greasy secretion with a powerful odour, produced in a glandular sac of the male musk deer and used in the manufacture of perfumes. A similar secretion produced by the otter and the civet. A synthetic organic compound used as a substitute for the above. The odour of musk. The musk deer (genus Moschus). The musk plant (Mimulus moschatus). A plant of the genus Erodium (Erodium moschatum); the musky heronsbill. A plant of the genus Muscari; grape hyacinth. The scent of human genitalia when aroused or unwashed. To perfume with musk.