| ethologist | (noun) a zoologist who studies the behavior of animals in their natural habitats | - |
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| ethology | (noun) the branch of zoology that studies the behavior of animals in their natural habitats | - |
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| ethos | (noun) (anthropology) the distinctive spirit of a culture or an era | - |
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| ethosuximide | (noun) an anticonvulsant drug (trade names Emeside and Zarontin) used to treat petit mal epilepsy | Synonyms: Emeside, Zarontin |
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| ethoxyethane | (noun) a colorless volatile highly flammable liquid formerly used as an inhalation anesthetic | Synonyms: diethyl ether, divinyl ether, ether, ethyl ether, vinyl ether |
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