| ETH | the branch of anthropology that deals with the division of humankind into races and with their origins and distribution and distinctive characteristics |
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| ETH | people of the same race or nationality who share a distinctive culture |
| ETH | a white crystalline powder (trade name Ethocaine) administered near nerves as a local anesthetic in dentistry and medicine |
| ETH | a zoologist who studies the behavior of animals in their natural habitats |
| ETH | the branch of zoology that studies the behavior of animals in their natural habitats |
| ETH | the distinctive spirit of a people or an era |
| ETH | an anticonvulsant drug (trade names Emeside and Zarontin) used to treat petit mal epilepsy |
| ETH | a colorless volatile highly inflammable liquid used as an inhalation anesthetic |
| ETH | a nonflammable liquid (trade name Ethrane) used as an inhalation general anesthetic |
| ETH | an antibiotic (trade name Erythrocin or E-Mycin or Ethril or Ilosone or Pediamycin) obtained from the actinomycete Streptomyces erythreus |
| ETH | the univalent hydrocarbon radical C2H5 derived from ethane by the removal of one hydrogen atom |
| ETH | a fragrant colorless flammable volatile liquid ester made from ethanol and acetic acid |