| aeronaut | (noun) someone who operates an aircraft | Synonyms: aviator, flier, flyer |
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| aeronautics | (noun) the theory and practice of navigation through air or space | Synonyms: astronautics |
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| aquanaut | (noun) an underwater swimmer equipped with a face mask and foot fins and either a snorkel or an air cylinder | Synonyms: skin-diver |
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| (noun) a skilled worker who can live in underwater installations and participate in scientific research | Synonyms: oceanaut |
| argonaut | (noun) someone engaged in a dangerous but potentially rewarding adventure | - |
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| astronaut | (noun) a person trained to travel in a spacecraft | Synonyms: cosmonaut, spaceman |
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| astronautics | (noun) the theory and practice of navigation through air or space | Synonyms: aeronautics |
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| carnauba | (noun) Brazilian fan palm having an edible root; source of a useful leaf fiber and a brittle yellowish wax | Synonyms: carnauba palm, Copernicia cerifera, Copernicia prunifera, wax palm |
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| (noun) hard yellowish to brownish wax from leaves of the carnauba palm used especially in floor waxes and polishes | Synonyms: carnauba wax |
| cosmonaut | (noun) a person trained to travel in a spacecraft | Synonyms: astronaut, spaceman |
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| cybernaut | (noun) a computer user who uses the internet; someone who explores cyberspace | - |
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| dreadnaught | (noun) battleship that has big guns all of the same caliber | Synonyms: dreadnought |
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| inaudibility | (noun) the quality of not being perceptible by the ear | Synonyms: inaudibleness |
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| inaudibleness | (noun) the quality of not being perceptible by the ear | Synonyms: inaudibility |
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| inaugural | (noun) the ceremonial induction into a position | Synonyms: inauguration |
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| (noun) an address delivered at an inaugural ceremony (especially by a United States president) | Synonyms: inaugural address |
| inauguration | (noun) the ceremonial induction into a position | Synonyms: inaugural |
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| (noun) the act of starting a new operation or practice | Synonyms: startup |
| inauspiciousness | (noun) the quality of suggesting an unsuccessful result | Synonyms: unpropitiousness |
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| juggernaut | (noun) a massive inexorable force that seems to crush everything in its way | Synonyms: steamroller |
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| monaul | (noun) brilliantly colored pheasant of southern Asia | Synonyms: monal |
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| nauch | (noun) an intricate traditional dance in India performed by professional dancing girls | Synonyms: nautch, nautch dance |
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| naught | (noun) complete failure | - |
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| (noun) a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential | Synonyms: aught, cipher, cypher, goose egg, nada, nil, nix, nothing, null, zero, zilch, zip, zippo |
| naughtiness | (noun) an attribute of mischievous children | Synonyms: badness, mischievousness |
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| naumachia | (noun) a naval spectacle; a mock sea battle put on by the ancient Romans | Synonyms: naumachy |
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| naumachy | (noun) a naval spectacle; a mock sea battle put on by the ancient Romans | Synonyms: naumachia |
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| naupathia | (noun) motion sickness experienced while traveling on water | Synonyms: mal de mer, seasickness |
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| nausea | (noun) disgust so strong it makes you feel sick | - |
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| (noun) the state that precedes vomiting | Synonyms: sickness |
| nauseant | (noun) a medicine that induces nausea and vomiting | Synonyms: emetic, vomit, vomitive |
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| nauseatingness | (noun) extreme unpalatability to the mouth | Synonyms: disgustingness, distastefulness, sickeningness, unsavoriness |
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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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| schnauzer | (noun) old German breed of sturdy black or greyish wire-haired terriers having a blunt muzzle ranging in size from fairly small to very large; used as ratters and guard dogs or police dogs | - |
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| unau | (noun) relatively small fast-moving sloth with two long claws on each front foot | Synonyms: Choloepus didactylus, two-toed sloth, unai |
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| (noun) a sloth of Central America that has two long claws on each forefoot and three long claws on each hindfoot | Synonyms: Choloepus hoffmanni, two-toed sloth, unai |