| agua | (noun) largest known toad species; native to Central America; valuable destroyer of insect pests | Synonyms: agua toad, Bufo marinus |
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| aguacate | (noun) a pear-shaped tropical fruit with green or blackish skin and rich yellowish pulp enclosing a single large seed | Synonyms: alligator pear, avocado, avocado pear |
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| armguard | (noun) a protective covering for the wrist or arm that is used in archery and fencing and other sports | Synonyms: bracer |
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| bilingual | (noun) a person who speaks two languages fluently | Synonyms: bilingualist |
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| bilingualism | (noun) the ability to speak two languages colloquially | - |
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| bilingualist | (noun) a person who speaks two languages fluently | Synonyms: bilingual |
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| blackguard | (noun) someone who is morally reprehensible | Synonyms: bounder, cad, dog, heel, hound |
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| bodyguard | (noun) a group of men who escort and protect some important person | - |
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| (noun) someone who escorts and protects a prominent person | Synonyms: escort |
| coastguard | (noun) a military service responsible for the safety of maritime traffic in coastal waters | - |
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| coastguardsman | (noun) a member of a coastguard | - |
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| deoxyguanosine | (noun) a nucleoside component of DNA; composed of guanine and deoxyribose | Synonyms: guanosine |
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| disambiguation | (noun) clarification that follows from the removal of ambiguity | - |
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| disambiguator | (noun) (computer science) a natural language processing application that tries to determine the intended meaning of a word or phrase by examining the linguistic context in which it is used | - |
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| fireguard | (noun) a metal screen before an open fire for protection (especially against flying sparks) | Synonyms: fire screen |
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| (noun) a narrow field that has been cleared to check the spread of a prairie fire or forest fire | Synonyms: firebreak |
| guacamole | (noun) a dip made of mashed avocado mixed with chopped onions and other seasonings | - |
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| guacharo | (noun) nocturnal fruit-eating bird of South America that has fatty young yielding an oil that is used instead of butter | Synonyms: oilbird, Steatornis caripensis |
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| guaiac | (noun) hard greenish-brown wood of the lignum vitae tree and other trees of the genus Guaiacum | Synonyms: guaiacum, lignum vitae |
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| guaiacum | (noun) hard greenish-brown wood of the lignum vitae tree and other trees of the genus Guaiacum | Synonyms: guaiac, lignum vitae |
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| (noun) medicinal resin from the lignum vitae tree | - |
| guama | (noun) tropical tree of Central America and West Indies and Puerto Rico having spikes of white flowers; used as shade for coffee plantations | Synonyms: Inga laurina |
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| guan | (noun) any of several large turkey-like game birds of the family Cracidae; native to jungles of tropical America; resembling the curassows and valued as food | - |
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| guanabana | (noun) large spiny tropical fruit with tart pulp related to custard apples | Synonyms: soursop |
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| guanabenz | (noun) antihypertensive drug (trade name Wytensin) that reduces blood pressure by its effect on the central nervous system | Synonyms: Wytensin |
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| guanaco | (noun) wild llama | Synonyms: Lama guanicoe |
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| guanine | (noun) a purine base found in DNA and RNA; pairs with cytosine | Synonyms: G |
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| guano | (noun) the excrement of sea birds; used as fertilizer | - |
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| guanosine | (noun) a nucleoside component of DNA; composed of guanine and deoxyribose | Synonyms: deoxyguanosine |
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| guar | (noun) drought-tolerant herb grown for forage and for its seed which yield a gum used as a thickening agent or sizing material | Synonyms: cluster bean, Cyamopsis psoraloides, Cyamopsis tetragonolobus |
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| guarani | (noun) the basic unit of money in Paraguay; equal to 100 centimos | - |
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| guaranine | (noun) Guaranine is the name used to describe caffeine derived from the guarana plant. | - |
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| guarantee | (noun) a written assurance that some product or service will be provided or will meet certain specifications | Synonyms: warrant, warrantee, warranty |
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| (noun) an unconditional commitment that something will happen or that something is true | - |
| (noun) a collateral agreement to answer for the debt of another in case that person defaults | Synonyms: guaranty |
| guarantor | (noun) one who provides a warrant or guarantee to another | Synonyms: surety, warranter, warrantor |
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| guaranty | (noun) a collateral agreement to answer for the debt of another in case that person defaults | Synonyms: guarantee |
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| guard | (noun) a position on a basketball team | - |
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| (noun) the duty of serving as a sentry | Synonyms: guard duty, sentry duty, sentry go |
| (noun) (American football) a position on the line of scrimmage between the center and the tackles | - |
| (noun) a precautionary measure warding off impending danger or damage or injury etc. | Synonyms: precaution, safeguard |
| (noun) a device designed to prevent injury or accidents | Synonyms: safety, safety device |
| (noun) a posture of defence in boxing or fencing | - |
| (noun) a military unit serving to protect some place or person | - |
| (noun) the person who lines up between the center and the tackles on the offensive line of a football team on the line of scrimmage | - |
| (noun) a person who keeps watch over something or someone | - |
| (noun) the person who plays the position of guard on a basketball team | - |
| guardhouse | (noun) a military facility that serves as the headquarters for military police and in which military prisoners can be detained | - |
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| guardian | (noun) a person who cares for persons or property | Synonyms: defender, protector, shielder |
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| guardianship | (noun) the responsibility of a guardian or keeper | Synonyms: keeping, safekeeping |
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| (noun) attention and management implying responsibility for safety | Synonyms: care, charge, tutelage |
| guardrail | (noun) a railing placed alongside a stairway or road for safety | Synonyms: safety rail |
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| guardroom | (noun) a room used by soldiers on guard | - |
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| (noun) a cell in which soldiers who are prisoners are confined | - |
| guardsman | (noun) a soldier who is a member of a unit called `the guard' or `guards' | - |
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| guava | (noun) tropical fruit having yellow skin and pink pulp; eaten fresh or used for e.g. jellies | - |
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| (noun) small tropical American shrubby tree; widely cultivated in warm regions for its sweet globular yellow fruit | Synonyms: guava bush, Psidium guajava, true guava |
| (noun) small tropical shrubby tree bearing small yellowish fruit | Synonyms: Psidium littorale, strawberry guava, yellow cattley guava |
| guayule | (noun) much-branched subshrub with silvery leaves and small white flowers of Texas and northern Mexico; cultivated as a source of rubber | Synonyms: Parthenium argentatum |
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| iguana | (noun) large herbivorous tropical American arboreal lizards with a spiny crest along the back; used as human food in Central America and South America | Synonyms: common iguana, Iguana iguana |
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| iguanid | (noun) lizards of the New World and Madagascar and some Pacific islands; typically having a long tail and bright throat patch in males | Synonyms: iguanid lizard |
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| iguanodon | (noun) massive herbivorous bipedal dinosaur with a long heavy tail; common in Europe and northern Africa; early Cretaceous period | - |
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| interlanguage | (noun) a common language used by speakers of different languages | Synonyms: koine, lingua franca |
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| jagua | (noun) tree of the West Indies and northern South America bearing succulent edible orange-sized fruit | Synonyms: Genipa Americana, genipap fruit, marmalade box |
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| jaguar | (noun) a large spotted feline of tropical America similar to the leopard; in some classifications considered a member of the genus Felis | Synonyms: Felis onca, panther, Panthera onca |
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| jaguarondi | (noun) long-bodied long-tailed tropical American wildcat | Synonyms: eyra, Felis yagouaroundi, jaguarundi, jaguarundi cat |
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| jaguarundi | (noun) long-bodied long-tailed tropical American wildcat | Synonyms: eyra, Felis yagouaroundi, jaguarondi, jaguarundi cat |
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| language | (noun) the mental faculty or power of vocal communication | Synonyms: speech |
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| (noun) the cognitive processes involved in producing and understanding linguistic communication | Synonyms: linguistic process |
| (noun) a systematic means of communicating by the use of sounds or conventional symbols | Synonyms: linguistic communication |
| (noun) (language) communication by word of mouth | Synonyms: oral communication, speech, speech communication, spoken communication, spoken language, voice communication |
| (noun) the text of a popular song or musical-comedy number | Synonyms: lyric, words |
| (noun) a system of words used to name things in a particular discipline | Synonyms: nomenclature, terminology |
| lifeguard | (noun) an attendant employed at a beach or pool to protect swimmers from accidents | Synonyms: lifesaver |
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| lingua | (noun) a mobile mass of muscular tissue covered with mucous membrane and located in the oral cavity | Synonyms: clapper, glossa, tongue |
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| lingual | (noun) a consonant that is produced with the tongue and other speech organs | - |
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| mahagua | (noun) shrubby tree widely distributed along tropical shores; yields a light tough wood used for canoe outriggers and a fiber used for cordage and caulk; often cultivated for ornament | Synonyms: balibago, Hibiscus tiliaceus, mahoe, majagua, purau |
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| (noun) erect forest tree of Cuba and Jamaica having variably hairy leaves and orange-yellow or orange-red flowers; yields a moderately dense timber for cabinetwork and gunstocks | Synonyms: blue mahoe, Cuban bast, Hibiscus elatus, mahoe, majagua |
| majagua | (noun) shrubby tree widely distributed along tropical shores; yields a light tough wood used for canoe outriggers and a fiber used for cordage and caulk; often cultivated for ornament | Synonyms: balibago, Hibiscus tiliaceus, mahagua, mahoe, purau |
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| (noun) erect forest tree of Cuba and Jamaica having variably hairy leaves and orange-yellow or orange-red flowers; yields a moderately dense timber for cabinetwork and gunstocks | Synonyms: blue mahoe, Cuban bast, Hibiscus elatus, mahagua, mahoe |
| mapinguari | (noun) supposed human-sized sloth-like creature reportedly sighted by Indians in the Amazon rain forest | - |
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| metalanguage | (noun) a language that can be used to describe languages | - |
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| monolingual | (noun) a person who knows only one language | - |
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| mudguard | (noun) a curved piece above the wheel of a bicycle or motorcycle to protect the rider from water or mud thrown up by the wheels | Synonyms: splash-guard, splash guard |
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| paralanguage | (noun) the use of manner of speaking to communicate particular meanings | Synonyms: paralinguistic communication |
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| rearguard | (noun) a detachment assigned to protect the rear of a (retreating) military body | - |
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| safeguard | (noun) a precautionary measure warding off impending danger or damage or injury etc. | Synonyms: guard, precaution |
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| (noun) a document or escort providing safe passage through a region especially in time of war | Synonyms: safe-conduct |
| saguaro | (noun) extremely large treelike cactus of desert regions of southwestern United States having a thick columnar sparsely branched trunk bearing white flowers and edible red pulpy fruit | Synonyms: Carnegiea gigantea, sahuaro |
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| slanguage | (noun) language characterized by excessive use of slang or cant | - |
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| taguan | (noun) East Indian flying squirrel | Synonyms: flying cat, flying marmot, Petaurista petaurista |
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| thioguanine | (noun) an antineoplastic drug used to treat acute leukemias | - |
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| vanguard | (noun) the position of greatest importance or advancement; the leading position in any movement or field | Synonyms: cutting edge, forefront |
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| (noun) the leading units moving at the head of an army | Synonyms: van |
| (noun) any creative group active in the innovation and application of new concepts and techniques in a given field (especially in the arts) | Synonyms: avant-garde, new wave, van |