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mustang a wild horse of the western plains of North America, descended from Spanish stock.
mustard any of various plants native to Eurasia that bear yellow flowers and seed pods. [3 definitions]
mustard gas a liquid chemical-warfare agent that causes severe skin burns, damages the lungs, and can cause blindness and death.
mustard plaster a pungent medicinal paste made of powdered mustard and water that is spread on a cloth, steamed, and applied usu. to the chest to relieve congestion.
musteline of or concerning a large family of fur-bearing carnivores, including the weasel, mink, badger, and skunk.
muster to cause (troops or the like) to come together. [5 definitions]
mustn't contracted form of "must not".
musty smelling or tasting of mold. [2 definitions]
mutable able or likely to change. [2 definitions]
mutagen an agent or substance such as radiation that is capable of increasing the frequency of mutation.
mutant an organism that differs from its parents as a result of mutation.
mutate to display or cause to display a physical trait or characteristic that is different from one's parent or parents as a result of a change within a gene or chromosome.
mutation a sudden, apparently abnormal change or alteration in a genetically determined structure, as opposed to gradual evolutionary change. [3 definitions]
mutatis mutandis (Latin) all required changes of substance or wording having been made.
mute not speaking or uttering sound; silent. [9 definitions]
mutilate to sever or destroy a limb or other essential part of (a person or animal). [2 definitions]
mutineer one who engages in open rebellion against constituted authority, esp. against one's military superior.
mutinous concerning, inclined to, or engaged in a mutiny. [2 definitions]
mutiny open rebellion of subordinates against their established leaders, esp. of military personnel against their superior officers. [2 definitions]
mutism the physical or psychological inability or refusal to speak.
mutt a dog of mixed or unknown breed; mongrel.