| chemoautotroph | (noun) An organism that depends on chemicals for its energy and principally on carbon dioxide for its carbon. | Synonyms: chemotrophic autotroph |
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| coauthor | (noun) a writer who collaborates with others in writing something | Synonyms: joint author |
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| cosmonaut | (noun) a person trained to travel in a spacecraft | Synonyms: astronaut, spaceman |
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| cryocautery | (noun) application of a substance that destroys tissue by freezing it | - |
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| (noun) an instrument for destroying tissue by freezing it | - |
| cybernaut | (noun) a computer user who uses the internet; someone who explores cyberspace | - |
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| electrocautery | (noun) application of a needle heated by an electric current to destroy tissue (as to remove warts) | - |
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| fauteuil | (noun) an upholstered armchair | - |
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| flautist | (noun) someone who plays the flute | Synonyms: flute player, flutist |
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| hautbois | (noun) a slender double-reed instrument; a woodwind with a conical bore and a double-reed mouthpiece | Synonyms: hautboy, oboe |
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| hautboy | (noun) a slender double-reed instrument; a woodwind with a conical bore and a double-reed mouthpiece | Synonyms: hautbois, oboe |
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| hauteur | (noun) overbearing pride evidenced by a superior manner toward inferiors | Synonyms: arrogance, haughtiness, high-handedness, lordliness |
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| incaution | (noun) the trait of forgetting or ignoring possible danger | Synonyms: incautiousness |
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| incautiousness | (noun) the trait of forgetting or ignoring possible danger | Synonyms: incaution |
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| juggernaut | (noun) a massive inexorable force that seems to crush everything in its way | Synonyms: steamroller |
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| nautch | (noun) an intricate traditional dance in India performed by professional dancing girls | Synonyms: nauch, nautch dance |
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| nautilus | (noun) cephalopod of the Indian and Pacific oceans having a spiral shell with pale pearly partitions | Synonyms: chambered nautilus, pearly nautilus |
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| (noun) cephalopod mollusk of warm seas whose females have delicate papery spiral shells | Synonyms: Argonaut, Argonauta argo, paper nautilus |
| (noun) a submarine that is propelled by nuclear power | Synonyms: nuclear-powered submarine, nuclear submarine |
| oceanaut | (noun) a skilled worker who can live in underwater installations and participate in scientific research | Synonyms: aquanaut |
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| pahautea | (noun) evergreen tree of New Zealand resembling the kawaka | Synonyms: Libocedrus bidwillii, mountain pine |
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| precaution | (noun) a precautionary measure warding off impending danger or damage or injury etc. | Synonyms: guard, safeguard |
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| (noun) the trait of practicing caution in advance | - |
| (noun) judiciousness in avoiding harm or danger | Synonyms: care, caution, forethought |
| sauerkraut | (noun) shredded cabbage fermented in brine | - |
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| saute | (noun) a dish of sauteed food | - |
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| sauteing | (noun) cooking in fat or oil in a pan or griddle | Synonyms: frying |
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| semiautomatic | (noun) a pistol that is a semiautomatic firearm capable of loading and firing continuously | Synonyms: semiautomatic pistol |
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| tautness | (noun) lack of movement or room for movement | Synonyms: tightness |
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| (noun) the physical condition of being stretched or strained | Synonyms: tenseness, tension, tensity |
| tautog | (noun) large dark-colored food fish of the Atlantic coast of North America | Synonyms: blackfish, Tautoga onitis |
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| tautology | (noun) useless and pointless repetition | - |
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| (noun) (logic) a statement that is necessarily true | - |
| thermocautery | (noun) cautery (destruction of tissue) by heat | - |
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| umlaut | (noun) a diacritical mark (two dots) placed over a vowel to indicate a change in sound in some languages | - |
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| yautia | (noun) tropical American aroid having edible tubers that are cooked and eaten like yams or potatoes | Synonyms: malanga, spoonflower, tannia, Xanthosoma atrovirens, Xanthosoma sagittifolium |
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