| eta | (noun) the 7th letter of the Greek alphabet | - |
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| etagere | (noun) a piece of furniture with open shelves for displaying small ornaments | - |
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| etamin | (noun) a soft cotton or worsted fabric with an open mesh; used for curtains or clothing etc. | Synonyms: etamine |
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| etamine | (noun) a soft cotton or worsted fabric with an open mesh; used for curtains or clothing etc. | Synonyms: etamin |
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| etanercept | (noun) a genetically engineered anti-TNF compound (trade name Enbrel) consisting of receptors that bind TNF; it is injected twice a week in the treatment of rheumatoid arthritis | Synonyms: Enbrel |
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| etcetera | (noun) additional unspecified odds and ends; more of the same; entity, other pronoun; pronoun, entity; quantifier: other | - |
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| etcher | (noun) someone who etches | - |
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| etching | (noun) making engraved or etched plates and printing designs from them | Synonyms: engraving |
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| (noun) an etched plate made with the use of acid | - |
| (noun) an impression made from an etched plate | - |
| eternity | (noun) a state of eternal existence believed in some religions to characterize the afterlife | Synonyms: timeless existence, timelessness |
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| (noun) time without end | Synonyms: infinity |
| (noun) a seemingly endless time interval (waiting) | - |
| ethanal | (noun) a colorless volatile water-soluble liquid aldehyde used chiefly in the manufacture of acetic acid and perfumes and drugs | Synonyms: acetaldehyde |
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| ethanamide | (noun) a colorless solid amide of acetic acid used as a solvent and in the synthesis of organic compounds | Synonyms: acetamide |
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| ethane | (noun) a colorless odorless alkane gas used as fuel | Synonyms: C2H6 |
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| ethanediol | (noun) a sweet but poisonous syrupy liquid used as an antifreeze and solvent | Synonyms: ethylene glycol, glycol |
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| ethanoate | (noun) a salt or ester of acetic acid | Synonyms: acetate |
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| ethanol | (noun) the intoxicating agent in fermented and distilled liquors; used pure or denatured as a solvent or in medicines and colognes and cleaning solutions and rocket fuel; proposed as a renewable clean-burning additive to gasoline | Synonyms: ethyl alcohol, fermentation alcohol, grain alcohol |
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| ethchlorvynol | (noun) a mild sedative-hypnotic drug (trade name Placidyl) | Synonyms: Placidyl |
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| ethene | (noun) a flammable colorless gaseous alkene; obtained from petroleum and natural gas and used in manufacturing many other chemicals; sometimes used as an anesthetic | Synonyms: ethylene |
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| ether | (noun) a colorless volatile highly flammable liquid formerly used as an inhalation anesthetic | Synonyms: diethyl ether, divinyl ether, ethoxyethane, ethyl ether, vinyl ether |
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| (noun) a medium that was once supposed to fill all space and to support the propagation of electromagnetic waves | Synonyms: aether |
| (noun) any of a class of organic compounds that have two hydrocarbon groups linked by an oxygen atom | - |
| (noun) the fifth and highest element after air and earth and fire and water; was believed to be the substance composing all heavenly bodies | Synonyms: quintessence |
| ethernet | (noun) a type of network technology for local area networks; coaxial cable carries radio frequency signals between computers at a rate of 10 megabits per second | - |
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| ethic | (noun) the principles of right and wrong that are accepted by an individual or a social group | Synonyms: moral principle, value-system, value orientation |
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| (noun) a system of principles governing morality and acceptable conduct | Synonyms: ethical code |
| ethicality | (noun) The state, quality or manner of conforming to accepted standards of conduct. | - |
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| ethician | (noun) a philosopher who specializes in ethics | Synonyms: ethicist |
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| ethicism | (noun) a doctrine that ethics and ethical ideas are valid and important | - |
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| ethicist | (noun) a philosopher who specializes in ethics | Synonyms: ethician |
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| ethics | (noun) the philosophical study of moral values and rules | Synonyms: moral philosophy |
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| (noun) motivation based on ideas of right and wrong | Synonyms: ethical motive, morality, morals |
| ethmoid | (noun) one of the eight bones of the cranium; a small bone filled with air spaces that forms part of the eye sockets and the nasal cavity | Synonyms: ethmoid bone |
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| ethnarch | (noun) the ruler of a province (as in the Roman Empire and Byzantine Empire) or certain religious rulers with secular authority | - |
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| ethnic | (noun) a person who is a member of an ethnic group | - |
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| ethnicity | (noun) an ethnic quality or affiliation resulting from racial or cultural ties | - |
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| ethnocentrism | (noun) belief in the superiority of one's own ethnic group | - |
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| ethnographer | (noun) an anthropologist who does ethnography | - |
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| ethnography | (noun) the branch of anthropology that provides scientific description of individual human societies | Synonyms: descriptive anthropology |
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| ethnologist | (noun) an anthropologist who studies ethnology | - |
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| ethnology | (noun) 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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| ethnos | (noun) people of the same race or nationality who share a distinctive culture | Synonyms: ethnic group |
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| 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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| ethyl | (noun) the univalent hydrocarbon radical C2H5 derived from ethane by the removal of one hydrogen atom | Synonyms: ethyl group, ethyl radical |
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| ethylene | (noun) a flammable colorless gaseous alkene; obtained from petroleum and natural gas and used in manufacturing many other chemicals; sometimes used as an anesthetic | Synonyms: ethene |
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| ethyne | (noun) a colorless flammable gas used chiefly in welding and in organic synthesis | Synonyms: acetylene, alkyne |
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| etiolation | (noun) (botany) the act of causing a plant to develop without chlorophyll by growing it without exposure to sunlight | - |
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| (noun) the act of weakening by stunting the growth or development of something | - |
| (noun) a pale and sickly appearance | - |
| etiologist | (noun) a specialist in the etiology of diseases | Synonyms: aetiologist |
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| etiology | (noun) the philosophical study of causation | Synonyms: aetiology |
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| (noun) the cause of a disease | Synonyms: aetiology |
| etiquette | (noun) rules governing socially acceptable behavior | - |
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| etna | (noun) a gas burner used in laboratories; has an air valve to regulate the mixture of gas and air | Synonyms: bunsen, bunsen burner |
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| etodolac | (noun) a nonsteroidal anti-inflammatory drug (trade name Lodine) | Synonyms: Lodine |
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| etude | (noun) a short composition for a solo instrument; intended as an exercise or to demonstrate technical virtuosity | - |
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| etui | (noun) small ornamental ladies' bag for small articles | - |
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| etymologist | (noun) a lexicographer who specializes in etymology | - |
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| etymologizing | (noun) (historical linguistics) an explanation of the historical origins of a word or phrase | Synonyms: derivation, deriving |
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| etymology | (noun) the study of the sources and development of words | - |
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| (noun) a history of a word | - |
| etymon | (noun) a simple form inferred as the common basis from which related words in several languages can be derived by linguistic processes | Synonyms: root |
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