20-letter words starting with tri
- tribromoacetaldehyde — bromal.
- trichloroacetic acid — a toxic, deliquescent, and colorless crystalline compound, C 2 HCl 3 O 2 , soluble in water, alcohol, and ether: used in the synthesis of pharmaceuticals, herbicides, and other chemicals, and as a reagent for the detection of albumin. Abbreviation: TCA.
- trigeminal neuralgia — tic douloureux.
- trigonometric series — an infinite series involving sines and cosines of increasing integral multiples of a variable.
- trimetric projection — a three-dimensional projection with three different linear scales at arbitrary angles.
- triphenylmethane dye — any of a great number of dyes, as gentian violet, fuchsin, and rosaniline, produced from triphenylmethane by replacement of the ring hydrogen atoms with hydroxy, amino, sulfo, or other atoms or groups.
- triple witching hour — the last hour of trading on the New York Stock Exchange on the four Fridays each year when stock options, stock index futures, and options on such futures simultaneously expire: regarded as a time of extreme volatility in trading.
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