| 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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| altogether | (noun) informal terms for nakedness | Synonyms: birthday suit, raw |
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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 | - |
| bethel | (noun) a house of worship (especially one for sailors) | - |
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| blether | (noun) idle or foolish and irrelevant talk | Synonyms: chin music, idle talk, prate, prattle |
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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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| 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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| 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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| metheglin | (noun) spiced or medicated mead | - |
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| methenamine | (noun) antibacterial agent (trade names Mandelamine and Urex) that is contained in many products that are used to treat urinary infections | Synonyms: Mandelamine, Urex |
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| netherworld | (noun) (religion) the world of the dead | Synonyms: Hades, Hell, infernal region, Scheol, underworld |
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| sweetheart | (noun) a person loved by another person | Synonyms: steady, sweetie, truelove |
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| (noun) a very attractive or seductive looking woman | Synonyms: beauty, dish, knockout, looker, lulu, mantrap, peach, ravisher, smasher, stunner |
| (noun) any well-liked individual | - |
| (noun) a beloved person; used as terms of endearment | Synonyms: baby, beloved, darling, dear, dearest, dearie, deary, honey, love, sweetie |
| telethermometer | (noun) a thermometer that registers the temperature at some distant point | - |
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| tether | (noun) restraint consisting of a rope (or light chain) used to restrain an animal | Synonyms: lead, leash |
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| tetherball | (noun) a game with two players who use rackets to strike a ball that is tethered to the top of a pole; the object is to wrap the string around the pole | - |
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| togetherness | (noun) affectionate closeness | - |
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| wether | (noun) male sheep especially a castrated one | - |
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