| anestrum | (noun) applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus | Synonyms: anestrus, anoestrum, anoestrus |
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| anoestrum | (noun) applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus | Synonyms: anestrum, anestrus, anoestrus |
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| antrum | (noun) a natural cavity or hollow in a bone | - |
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| centrum | (noun) the main body of a vertebra | - |
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| chetrum | (noun) 100 chetrums equal 1 ngultrum in Bhutan | - |
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| claustrum | (noun) a layer of grey matter in the brain adjacent to the lenticular nucleus | - |
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| colostrum | (noun) milky fluid secreted for the first day or two after parturition | Synonyms: foremilk |
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| diestrum | (noun) (of animals having several estrous cycles in one breeding season) a state or interval of sexual inactivity or quiescence between periods of activity | Synonyms: diestrus |
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| electrum | (noun) an alloy of gold and silver | - |
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| hippeastrum | (noun) amaryllis of tropical America often cultivated as a houseplant for its showy white to red flowers | Synonyms: Hippeastrum puniceum |
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| instrument | (noun) the means whereby some act is accomplished | Synonyms: tool |
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| (noun) a device that requires skill for proper use | - |
| (noun) any of various devices or contrivances that can be used to produce musical tones or sounds | Synonyms: musical instrument |
| (noun) (law) a document that states some contractual relationship or grants some right | Synonyms: legal document, legal instrument, official document |
| (noun) the semantic role of the entity (usually inanimate) that the agent uses to perform an action or start a process | Synonyms: instrumental role |
| (noun) a person used by another to gain an end | Synonyms: cat's-paw, pawn |
| instrumentalism | (noun) a system of pragmatic philosophy that considers idea to be instruments that should guide our actions and their value is measured by their success | - |
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| instrumentalist | (noun) someone who plays a music as a profession | Synonyms: musician, player |
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| instrumentality | (noun) an artifact (that is instrumental in accomplishing some end) for accomplishing some end | Synonyms: instrumentation, means |
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| (noun) the quality of being instrumental for some purpose | - |
| (noun) a subsidiary organ of government created for a special purpose | - |
| instrumentation | (noun) the act of providing or using the instruments needed for some implementation | - |
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| (noun) the act of arranging a piece of music for an orchestra and assigning parts to the different musical instruments | Synonyms: orchestration |
| (noun) an artifact (that is instrumental in accomplishing some end) for accomplishing some end | Synonyms: instrumentality, means |
| (noun) the instruments called for in a musical score or arrangement for a band or orchestra | - |
| lustrum | (noun) a ceremonial purification of the Roman population every five years following the census | - |
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| (noun) a period lasting five years | - |
| ngultrum | (noun) the basic unit of money in Bhutan | - |
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| nostrum | (noun) patent medicine whose efficacy is questionable | - |
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| (noun) hypothetical remedy for all ills or diseases; once sought by the alchemists | Synonyms: catholicon, cure-all, panacea |
| plectrum | (noun) a small thin device (of metal or plastic or ivory) used to pluck a stringed instrument | Synonyms: pick, plectron |
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| rostrum | (noun) beaklike projection of the anterior part of the head of certain insects such as e.g. weevils | Synonyms: snout |
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| (noun) a platform raised above the surrounding level to give prominence to the person on it | Synonyms: ambo, dais, podium, pulpit, soapbox, stump |
| spectrum | (noun) a broad range of related objects or values or qualities or ideas or activities | - |
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| (noun) an ordered array of the components of an emission or wave | - |
| strum | (noun) sound of strumming | - |
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| struma | (noun) abnormally enlarged thyroid gland; can result from underproduction or overproduction of hormone or from a deficiency of iodine in the diet | Synonyms: goiter, goitre, thyromegaly |
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| (noun) a form of tuberculosis characterized by swellings of the lymphatic glands | Synonyms: king's evil, scrofula |
| strumpet | (noun) a woman adulterer | Synonyms: adulteress, fornicatress, hussy, jade, loose woman, slut, trollop |
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| tantrum | (noun) a display of bad temper | Synonyms: conniption, fit, scene |
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| trump | (noun) a playing card in the suit that has been declared trumps | Synonyms: trump card |
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| (noun) a brass musical instrument with a brilliant tone; has a narrow tube and a flared bell and is played by means of valves | Synonyms: cornet, horn, trumpet |
| (noun) (card games) the suit that has been declared to rank above all other suits for the duration of the hand | - |
| trumpery | (noun) ornamental objects of no great value | Synonyms: falderol, folderal, frill, gimcrack, gimcrackery, nonsense |
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| (noun) nonsensical talk or writing | Synonyms: applesauce, codswallop, folderol, rubbish, trash, tripe, wish-wash |
| trumpet | (noun) a brass musical instrument with a brilliant tone; has a narrow tube and a flared bell and is played by means of valves | Synonyms: cornet, horn, trump |
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| trumpeter | (noun) large gregarious crane-like bird of the forests of South America having glossy black plumage and a loud prolonged cry; easily domesticated | - |
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| (noun) large pure white wild swan of western North America having a sonorous cry | Synonyms: Cygnus buccinator, trumpeter swan |
| (noun) a musician who plays the trumpet or cornet | Synonyms: cornetist |
| (noun) (formal) a person who announces important news | Synonyms: herald |
| trumpetfish | (noun) tropical Atlantic fish with a long snout; swims snout down | Synonyms: Aulostomus maculatus |
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| trumpets | (noun) pitcher plant of southeastern United States having erect yellow trumpet-shaped pitchers with wide mouths and erect lids | Synonyms: huntsman's horn, huntsman's horns, Sarracenia flava, yellow pitcher plant, yellow trumpet |
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| trumpetwood | (noun) tropical American tree with large peltate leaves and hollow stems | Synonyms: Cecropia peltata, imbauba, snake wood, trumpet-wood, trumpet tree |
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| trumping | (noun) (card games) the act of taking a trick with a trump when unable to follow suit | Synonyms: ruff |
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