| aether | (noun) a medium that was once supposed to fill all space and to support the propagation of electromagnetic waves | Synonyms: ether |
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| aforethought | (adjective) with planning and intention | Synonyms: planned, plotted |
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| altogether | (noun) informal terms for nakedness | Synonyms: birthday suit, raw |
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| (adverb) with everything included or counted | Synonyms: all told, in all |
| (adverb) with everything considered (and neglecting details) | Synonyms: all in all, on the whole, tout ensemble |
| (adverb) to a complete degree or to the full or entire extent; Completely or entirely | Synonyms: all, completely, entirely, right, totally, whole, wholly |
| amethopterin | (noun) toxic antimetabolite that limits cellular reproduction by acting as an antagonist to folic acid; used to treat certain cancers and psoriasis and rheumatoid arthritis | Synonyms: methotrexate, methotrexate sodium |
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| amethyst | (adjective) of a moderate purple color | - |
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| (noun) a transparent purple variety of quartz; used as a gemstone | - |
| amethystine | (adjective) containing or resembling amethyst | - |
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| aminomethane | (noun) a methyl with the hydrogen atom replaced by an amino radical | - |
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| anethole | (noun) an organic compound that is widely used as a flavoring substance. | Synonyms: anise camphor |
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| arethusa | (noun) any of several bog orchids of the genus Arethusa having 1 or 2 showy flowers | - |
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| bellwether | (noun) sheep that leads the herd often wearing a bell | - |
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| (noun) someone who assumes leadership of a movement or activity | - |
| beth | (noun) the 2nd letter of the Hebrew alphabet | - |
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| bethel | (noun) a house of worship (especially one for sailors) | - |
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| bethink | (verb) consider or ponder something carefully | - |
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| (verb) cause oneself to consider something | - |
| bioethics | (noun) the branch of ethics that studies moral values in the biomedical sciences | - |
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| blether | (noun) idle or foolish and irrelevant talk | Synonyms: chin music, idle talk, prate, prattle |
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| (verb) to talk foolishly | Synonyms: babble, blather, blither, smatter |
| bluethroat | (noun) songbird of northern Europe and Asia | Synonyms: Erithacus svecicus |
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| bonnethead | (noun) small harmless hammerhead having a spade-shaped head; abundant in bays and estuaries | Synonyms: bonnet shark, shovelhead, Sphyrna tiburo |
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| brethren | (noun) (plural) the lay members of a male religious order | - |
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| bullethead | (noun) a head shaped like a bullet | - |
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| cacoethes | (noun) an irrational but irresistible motive for a belief or action | Synonyms: mania, passion |
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| daleth | (noun) the 4th letter of the Hebrew alphabet | - |
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| dethaw | (verb) become or cause to become soft or liquid | Synonyms: dissolve, melt, thaw, unfreeze, unthaw |
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| dethrone | (verb) remove a monarch from the throne | - |
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| dethronement | (noun) the act of deposing someone; removing a powerful person from a position or office | Synonyms: deposition |
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| dexamethasone | (noun) a corticosteroid drug (trade names Decadron or Dexamethasone Intensol or Dexone or Hexadrol or Oradexon) used to treat allergies or inflammation | Synonyms: Decadron, Dexamethasone Intensol, Dexone, Hexadrol, Oradexon |
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| dichlorodiphenyltrichloroethane | (noun) an insecticide that is also toxic to animals and humans; banned in the United States since 1972 | Synonyms: DDT |
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| dichloromethane | (noun) a nonflammable liquid used as a solvent and paint remover and refrigerant | Synonyms: methylene chloride |
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| diethylmalonylurea | (noun) a barbiturate used as a hypnotic | Synonyms: barbital, barbitone, diethylbarbituric acid, veronal |
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| diethylstilbesterol | (noun) synthetic nonsteroid with the properties of estrogen; formerly used to treat menstrual problems but was found to be associated with vaginal cancers in the daughters of women so treated during pregnancy | Synonyms: DES, stilbesterol |
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| diethylstilbestrol | (noun) a potent estrogen used in medicine and in feed for livestock and poultry | Synonyms: DES, diethylstilboestrol, stilbestrol, stilboestrol |
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| diethylstilboestrol | (noun) a potent estrogen used in medicine and in feed for livestock and poultry | Synonyms: DES, diethylstilbestrol, stilbestrol, stilboestrol |
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| dimethylglyoxime | (noun) a compound used in analysis as a precipitant for palladium or nickel | - |
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| doublethink | (noun) believing two contradictory ideas at the same time | - |
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| eightieth | (adjective) the ordinal number of eighty in counting order | Synonyms: 80th |
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| (noun) position 80 in a countable series of things | - |
| erethism | (noun) an abnormally high degree of irritability or sensitivity to stimulation of an organ or body part | - |
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| 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 |
| ethereal | (adjective) of or containing or dissolved in ether | - |
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| (adjective) characterized by unusual lightness and delicacy | Synonyms: gossamer |
| (adjective) of heaven or the spirit | Synonyms: celestial, supernal |
| (adjective) characterized by lightness and insubstantiality; as impalpable or intangible as air | Synonyms: aerial, aeriform, aery, airy |
| etherealize | (verb) make ethereal | Synonyms: etherialise |
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| etherialise | (verb) make ethereal | Synonyms: etherealize |
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| etherify | (verb) change into an ether | - |
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| etherise | (verb) anesthetize with ether | Synonyms: etherize |
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| etherize | (verb) anesthetize with ether | Synonyms: etherise |
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| 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 |
| ethical | (adjective) conforming to accepted standards of social or professional behavior | - |
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| (adjective) of or relating to the philosophical study of ethics | - |
| (adjective) adhering to ethical and moral principles | Synonyms: honorable, honourable |
| ethicality | (noun) The state, quality or manner of conforming to accepted standards of conduct. | - |
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| ethically | (adverb) in an ethical manner; from an ethical point of view; according to ethics | - |
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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 | (adjective) not acknowledging the God of Christianity and Judaism and Islam | Synonyms: heathen, heathenish, pagan |
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| (adjective) denoting or deriving from or distinctive of the ways of living built up by a group of people | Synonyms: cultural, ethnical |
| (noun) a person who is a member of an ethnic group | - |
| ethnical | (adjective) denoting or deriving from or distinctive of the ways of living built up by a group of people | Synonyms: cultural, ethnic |
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| ethnically | (adverb) with respect to ethnicity | - |
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| ethnicity | (noun) an ethnic quality or affiliation resulting from racial or cultural ties | - |
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| ethnocentric | (adjective) centered on a specific ethnic group, usually one's own | - |
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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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| ethnographic | (adjective) of or relating to ethnography | Synonyms: ethnographical |
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| ethnographical | (adjective) of or relating to ethnography | Synonyms: ethnographic |
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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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| ethnologic | (adjective) of or relating to ethnology | Synonyms: ethnological |
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| ethnological | (adjective) of or relating to ethnology | Synonyms: ethnologic |
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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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| fiftieth | (adjective) the ordinal number of fifty in counting order | Synonyms: 50th |
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| (noun) position 50 in a countable series of things | - |
| firethorn | (noun) any of various thorny shrubs of the genus Pyracantha bearing small white flowers followed by hard red or orange-red berries | Synonyms: fire thorn, pyracanth, Pyracantha |
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| flamethrower | (noun) a weapon that squirts ignited fuel for several yards | - |
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| forethought | (noun) judiciousness in avoiding harm or danger | Synonyms: care, caution, precaution |
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| (noun) planning or plotting in advance of acting | Synonyms: premeditation |
| forethoughtful | (adjective) thoughtful of the future | - |
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| fortieth | (adjective) the ordinal number of forty in counting order | Synonyms: 40th |
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| (noun) position 40 in a countable series of things | - |
| freethinker | (noun) a person who rejects religion | - |
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| freethinking | (noun) the doctrine that reason is the right basis for regulating conduct | Synonyms: rationalism |
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| glutethimide | (noun) sedative (trade name Doriden) used to treat some sleep disorders | Synonyms: Doriden |
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| goethite | (noun) a red or yellow or brown mineral; an oxide of iron that is a common constituent of rust | Synonyms: gothite |
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| heth | (noun) the 8th letter of the Hebrew alphabet | - |
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| hydroflumethiazide | (noun) diuretic used to treat hypertension and edema | - |
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| hydroxymethyl | (noun) a methyl with hydroxide replacing the hydrogen atoms | - |
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| hypaethral | (adjective) partly or entirely open to the sky | Synonyms: hypethral |
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| hypethral | (adjective) partly or entirely open to the sky | Synonyms: hypaethral |
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| indomethacin | (noun) a nonsteroidal anti-inflammatory drug (trade name Indocin) | Synonyms: Indocin |
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