| mutation | (noun) (genetics) any event that changes genetic structure; any alteration in the inherited nucleic acid sequence of the genotype of an organism | Synonyms: chromosomal mutation, genetic mutation |
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| (noun) a change or alteration in form or qualities | - |
| (noun) (biology) an organism that has characteristics resulting from chromosomal alteration | Synonyms: mutant, sport, variation |
| mutational | (adjective) of or relating to or resulting from mutation | - |
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| mutative | (adjective) of or pertaining to or marked by genetic mutation | - |
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| mutchkin | (noun) a Scottish unit of liquid measure equal to 0.9 United States pint | - |
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| mute | (adjective) expressed without speech | Synonyms: silent, tongueless, unspoken, wordless |
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| (adjective) unable to speak because of hereditary deafness | Synonyms: dumb, silent |
| (noun) a device used to soften the tone of a musical instrument | - |
| (noun) a deaf person who is unable to speak | Synonyms: deaf-and-dumb person, deaf-mute |
| (verb) deaden (a sound or noise), especially by wrapping | Synonyms: damp, dampen, dull, muffle, tone down |
| muted | (adjective) being or made softer or less loud or clear | Synonyms: dull, muffled, softened |
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| (adjective) in a softened tone | Synonyms: hushed, quiet, subdued |
| mutely | (adverb) without speaking | Synonyms: silently, taciturnly, wordlessly |
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| muteness | (noun) a refusal to speak when expected | Synonyms: silence |
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| (noun) the condition of being unable or unwilling to speak | Synonyms: mutism |
| mutilate | (verb) destroy or injure severely | Synonyms: mar |
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| (verb) damage or injure severely | Synonyms: cut up, mangle |
| (verb) alter so as to make unrecognizable | Synonyms: mangle, murder |
| mutilated | (adjective) having a part of the body crippled or disabled | Synonyms: maimed |
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| mutilation | (noun) the act of damaging the appearance or surface of something | Synonyms: defacement, disfiguration, disfigurement |
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| (noun) an injury that causes disfigurement or that deprives you of a limb or other important body part | - |
| mutilator | (noun) a person who mutilates or destroys or disfigures or cripples | Synonyms: maimer, mangler |
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| mutineer | (noun) someone who is openly rebellious and refuses to obey authorities (especially seamen or soldiers) | - |
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| mutinous | (adjective) consisting of or characterized by or inciting to mutiny | - |
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| (adjective) disposed to or in a state of mutiny | - |
| mutiny | (noun) open rebellion against constituted authority (especially by seamen or soldiers against their officers) | - |
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| (verb) engage in a mutiny against an authority | - |
| mutisia | (noun) any of various plants of the genus Mutisia | - |
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| mutism | (noun) the condition of being unable or unwilling to speak | Synonyms: muteness |
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| muton | (noun) the smallest unit of DNA where a mutation can occur | - |
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| mutt | (noun) an inferior dog or one of mixed breed | Synonyms: cur, mongrel |
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| mutter | (noun) a complaint uttered in a low and indistinct tone | Synonyms: grumble, grumbling, murmur, murmuring, muttering |
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| (noun) a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech | Synonyms: murmur, murmuration, murmuring, mussitation, muttering |
| (verb) make complaining remarks or noises under one's breath | Synonyms: croak, gnarl, grumble, murmur |
| (verb) talk indistinctly; usually in a low voice | Synonyms: maunder, mumble, mussitate |
| mutterer | (noun) a person who speaks softly and indistinctly | Synonyms: mumbler, murmurer |
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| muttering | (noun) a complaint uttered in a low and indistinct tone | Synonyms: grumble, grumbling, murmur, murmuring, mutter |
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| (noun) a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech | Synonyms: murmur, murmuration, murmuring, mussitation, mutter |
| mutton | (noun) meat from a mature domestic sheep | Synonyms: mouton |
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| muttonfish | (noun) similar to and often marketed as `red snapper' | Synonyms: Lutjanus analis, mutton snapper |
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| muttonhead | (noun) a stupid person; these words are used to express a low opinion of someone's intelligence | Synonyms: blockhead, bonehead, dumbass, dunce, dunderhead, fuckhead, hammerhead, knucklehead, loggerhead, lunkhead, numskull, shithead |
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| mutual | (adjective) concerning each of two or more persons or things; especially given or done in return | Synonyms: reciprocal |
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| (adjective) common to or shared by two or more parties | Synonyms: common |
| mutualism | (noun) the relation between two different species of organisms that are interdependent; each gains benefits from the other | Synonyms: symbiosis |
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| mutualist | (adjective) mutually dependent | Synonyms: interdependent, mutually beneficial |
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| mutuality | (noun) a reciprocal relation between interdependent entities (objects or individuals or groups) | Synonyms: interdependence, interdependency |
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| (noun) a reciprocality of sentiments | Synonyms: mutualness |
| mutually | (adverb) in a mutual or shared manner | Synonyms: reciprocally |
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| mutualness | (noun) a reciprocality of sentiments | Synonyms: mutuality |
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| muumuu | (noun) a woman's loose unbelted dress | Synonyms: Mother Hubbard |
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| muzhik | (noun) a Russian peasant (especially prior to 1917) | Synonyms: moujik, mujik, muzjik |
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| muzjik | (noun) a Russian peasant (especially prior to 1917) | Synonyms: moujik, mujik, muzhik |
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| muzzle | (noun) forward projecting part of the head of certain animals; includes the jaws and nose | - |
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| (noun) restraint put into a person's mouth to prevent speaking or shouting | Synonyms: gag |
| (noun) the open circular discharging end of a gun | Synonyms: gun muzzle |
| (noun) a leather or wire restraint that fits over an animal's snout (especially a dog's nose and jaws) and prevents it from eating or biting | - |
| (verb) tie a gag around someone's mouth in order to silence them | Synonyms: gag |
| (verb) prevent from speaking out | Synonyms: gag |
| (verb) fit with a muzzle | - |
| muzzler | (noun) someone who muzzles animals | - |
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| muzzy | (adjective) confused and vague; used especially of thinking | Synonyms: addled, befuddled, muddled, woolly-headed, woolly, wooly-minded, wooly |
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| (adjective) indistinct or hazy in outline | Synonyms: bleary, blurred, blurry, foggy, fuzzy, hazy |