| agnathan | (noun) eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms | Synonyms: jawless fish, jawless vertebrate |
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| aminomethane | (noun) a methyl with the hydrogen atom replaced by an amino radical | - |
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| athanor | (noun) a furnace that feeds itself so as to maintain a uniform temperature; used by alchemists | - |
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| chaetognathan | (adjective) of or relating to arrowworms | Synonyms: chaetognathous |
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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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| 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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| 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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| euthanasia | (noun) the act of killing someone painlessly (especially someone suffering from an incurable illness) | Synonyms: mercy killing |
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| euthanatise | (verb) intentionally cause the painless death of a person or animal | Synonyms: euthanatize, euthanise, euthanize, mercy kill |
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| euthanatize | (verb) intentionally cause the painless death of a person or animal | Synonyms: euthanatise, euthanise, euthanize, mercy kill |
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| euthanise | (verb) intentionally cause the painless death of a person or animal | Synonyms: euthanatise, euthanatize, euthanize, mercy kill |
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| euthanize | (verb) intentionally cause the painless death of a person or animal | Synonyms: euthanatise, euthanatize, euthanise, mercy kill |
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| firsthand | (adjective) received directly from a source | - |
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| (adverb) from the original source; directly | Synonyms: at first hand |
| halothane | (noun) a nonflammable inhalation anesthetic that produces general anesthesia; used along with analgesics and muscle relaxants for many types of surgical procedures | - |
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| lanthanide | (noun) any element of the lanthanide series (atomic numbers 57 through 71) | Synonyms: lanthanoid, lanthanon, rare-earth element, rare earth |
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| lanthanoid | (noun) any element of the lanthanide series (atomic numbers 57 through 71) | Synonyms: lanthanide, lanthanon, rare-earth element, rare earth |
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| lanthanon | (noun) any element of the lanthanide series (atomic numbers 57 through 71) | Synonyms: lanthanide, lanthanoid, rare-earth element, rare earth |
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| lanthanum | (noun) a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth | Synonyms: atomic number 57, La |
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| lefthander | (noun) a baseball pitcher who throws the ball with the left hand | Synonyms: left-handed pitcher, left-hander, left hander, lefty, southpaw |
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| leviathan | (noun) the largest or most massive thing of its kind | - |
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| (noun) monstrous sea creature symbolizing evil in the Old Testament | - |
| methanal | (noun) a colorless poisonous gas; made by the oxidation of methanol | Synonyms: formaldehyde |
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| methane | (noun) a colorless odorless gas used as a fuel | - |
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| methanogen | (noun) archaebacteria found in anaerobic environments such as animal intestinal tracts or sediments or sewage and capable of producing methane; a source of natural gas | - |
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| methanol | (noun) a light volatile flammable poisonous liquid alcohol; used as an antifreeze and solvent and fuel and as a denaturant for ethyl alcohol | Synonyms: methyl alcohol, wood alcohol, wood spirit |
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| mithan | (noun) ox of southeast Asia sometimes considered a domesticated breed of the gaur | Synonyms: Bibos frontalis, gayal |
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| nitrochloromethane | (noun) gaseous form of chloropicrin used as tear gas | - |
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| norethandrolone | (noun) a synthetic progestational hormone (trade name Norlutin) used in oral contraceptives and to treat endometriosis | Synonyms: norethindrone, norethindrone acetate, Norlutin |
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| perchloromethane | (noun) a colorless nonflammable liquid used as a solvent for fats and oils; because of its toxicity its use as a cleaning fluid or fire extinguisher has declined | Synonyms: carbon tet, carbon tetrachloride, tetrachloromethane |
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| polyurethan | (noun) any of various polymers containing the urethane radical; a wide variety of synthetic forms are made and used as adhesives or plastics or paints or rubber | Synonyms: polyurethane |
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| polyurethane | (noun) any of various polymers containing the urethane radical; a wide variety of synthetic forms are made and used as adhesives or plastics or paints or rubber | Synonyms: polyurethan |
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| righthander | (noun) a person who uses the right hand more skillfully than the left | Synonyms: right-hander, right hander |
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| shorthand | (adjective) written in abbreviated or symbolic form | - |
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| (noun) a method of writing rapidly using an abbreviated symbolic system | Synonyms: stenography, tachygraphy |
| tetrachloromethane | (noun) a colorless nonflammable liquid used as a solvent for fats and oils; because of its toxicity its use as a cleaning fluid or fire extinguisher has declined | Synonyms: carbon tet, carbon tetrachloride, perchloromethane |
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| thanatology | (noun) the branch of science that studies death (especially its social and psychological aspects) | - |
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| thanatophobia | (noun) a morbid fear of death | - |
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| thanatopsis | (noun) an essay expressing a view on the subject of death | - |
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| thane | (noun) a man ranking above an ordinary freeman and below a noble in Anglo-Saxon England (especially one who gave military service in exchange for land) | - |
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| (noun) a feudal lord or baron | - |
| thaneship | (noun) the position of thane | - |
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| thank | (verb) express gratitude or show appreciation to | Synonyms: give thanks |
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| thankful | (adjective) feeling or showing gratitude | Synonyms: grateful |
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| thankfully | (adverb) let us be thankful that | - |
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| (adverb) in a thankful manner; with thanks | Synonyms: gratefully |
| thankfulness | (noun) warm friendly feelings of gratitude | Synonyms: appreciativeness, gratefulness |
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| thankless | (adjective) not feeling or showing gratitude | Synonyms: ungrateful, unthankful |
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| (adjective) not likely to be rewarded | Synonyms: unappreciated, ungratifying |
| thanks | (noun) with the help of or owing to | - |
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| (noun) an acknowledgment of appreciation | - |
| thanksgiving | (noun) a short prayer of thanks before a meal | Synonyms: blessing, grace |
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| tribromoethanol | (noun) an intravenous anesthetic | Synonyms: tribromoethyl alcohol |
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| tribromomethane | (noun) colorless liquid haloform CHBr3 | Synonyms: bromoform |
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| trichloroethane | (noun) a heavy colorless highly toxic liquid used as a solvent to clean electronic components and for dry cleaning and as a fumigant; causes cancer and liver and lung damage | Synonyms: TCE, trichloroethylene |
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| trichloromethane | (noun) a volatile liquid haloform (CHCl3); formerly used as an anesthetic | Synonyms: chloroform |
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| trifluoromethane | (noun) colorless gas haloform CHF3 (similar to chloroform) | Synonyms: fluoroform |
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| triiodomethane | (noun) a yellowish crystalline solid with a penetrating odor; sometimes used as an antiseptic dressing | Synonyms: iodoform |
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| unthankful | (adjective) not feeling or showing gratitude | Synonyms: thankless, ungrateful |
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| urethane | (noun) an ester of carbamic acid | - |
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