| mepacrine | (noun) a drug (trade name Atabrine) used to treat certain worm infestations and once used to treat malaria | Synonyms: Atabrine, quinacrine, quinacrine hydrochloride |
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| meperidine | (noun) a synthetic narcotic drug (trade name Demerol) used to treat pain | Synonyms: Demerol, meperidine hydrochloride |
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| mephenytoin | (noun) a toxic anticonvulsant drug (trade name Mesantoin) used in the treatment of epilepsy when less toxic anticonvulsants have been ineffective | Synonyms: Mesantoin |
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| mephitis | (noun) a distinctive odor that is offensively unpleasant | Synonyms: fetor, foetor, malodor, malodour, reek, stench, stink |
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| (noun) a poisonous or foul smelling gas emitted from the earth | - |
| mephobarbital | (noun) a long-acting crystalline barbiturate (trade name Mebaral) used as a sedative and as an anticonvulsant in the treatment of epilepsy | Synonyms: Mebaral |
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| meprobamate | (noun) a sedative and tranquilizer (trade name Miltown and Equanil and Meprin) used to treat muscle tension and anxiety | Synonyms: Equanil, Meprin, Miltown |
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