| trio | (noun) a musical composition for three performers | - |
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| (noun) three people considered as a unit | Synonyms: threesome, triad, trinity |
| (noun) a set of three similar things considered as a unit | Synonyms: triad, triple, triplet |
| (noun) three performers or singers who perform together | - |
| (noun) the cardinal number that is the sum of one and one and one | Synonyms: 3, deuce-ace, III, leash, tercet, ternary, ternion, terzetto, three, threesome, tierce, trey, triad, trine, trinity, triplet, troika |
| triode | (noun) a thermionic vacuum tube having three electrodes; fluctuations of the charge on the grid control the flow from cathode to anode which makes amplification possible | - |
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| triolein | (noun) a naturally occurring glyceride of oleic acid that is found in fats and oils | Synonyms: olein |
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| triose | (noun) any monosaccharide sugar containing three atoms of carbon per molecule | - |
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| trioxide | (noun) an oxide containing three atoms of oxygen in the molecule | - |
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