| trig | (adjective) neat and smart in appearance | Synonyms: clean-cut, trim |
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| (noun) the mathematics of triangles and trigonometric functions | Synonyms: trigonometry |
| trigeminal | (noun) the main sensory nerve of the face and motor nerve for the muscles of mastication | Synonyms: fifth cranial nerve, nervus trigeminus, trigeminal nerve, trigeminus |
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| trigeminus | (noun) the main sensory nerve of the face and motor nerve for the muscles of mastication | Synonyms: fifth cranial nerve, nervus trigeminus, trigeminal, trigeminal nerve |
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| trigger | (noun) an act that sets in motion some course of events | Synonyms: induction, initiation |
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| (noun) lever that activates the firing mechanism of a gun | Synonyms: gun trigger |
| (noun) a device that activates or releases or causes something to happen | - |
| (verb) release or pull the trigger on | - |
| (verb) put in motion or move to act | Synonyms: activate, actuate, set off, spark, spark off, touch off, trigger off, trip |
| triggerfish | (noun) any of numerous compressed deep-bodied tropical fishes with sandpapery skin and erectile spines in the first dorsal fin | - |
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| triggerman | (noun) a professional killer who uses a gun | Synonyms: gun, gun for hire, gunman, gunslinger, hired gun, hit man, hitman, shooter, torpedo |
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| triglyceride | (noun) glyceride occurring naturally in animal and vegetable tissues; it consists of three individual fatty acids bound together in a single large molecule; an important energy source forming much of the fat stored by the body | - |
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| trigon | (noun) a triangular lyre of ancient Greece and Rome | - |
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| (noun) (astrology) one of four groups of the zodiac where each group consists of three signs separated from each other by 120 degrees | Synonyms: triplicity |
| (noun) a three-sided polygon | Synonyms: triangle, trilateral |
| trigonal | (adjective) having threefold symmetry | Synonyms: rhombohedral |
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| trigonometric | (adjective) of or relating to or according to the principles of trigonometry | - |
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| trigonometrician | (noun) a mathematician specializing in trigonometry | - |
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| trigonometry | (noun) the mathematics of triangles and trigonometric functions | Synonyms: trig |
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| trigram | (noun) a word that is written with three letters in an alphabetic writing system | - |
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