(chiefly attributive) triathlon / (computer graphics) triangle / (bodybuilding, colloquial, uncommon) triceps

Tested, hence, proven to be firm or reliable. / (law) Put on trial, taken before a lawcourt.

simple past tense and past participle of try

simple past tense and past participle of try on

three

(chemistry) Used in combination with a known element name (e.g. 'tri-silicon') to designate an unknown element that would reside three periods lower than the known element on a Mendeleev-type periodic table. See Mendeleev's predicted elements.

(organic chemistry) A flammable compound which forms a corrosive solution in water and is used as a buffer and emulsifying agent.

(organic chemistry) A phosphoric acid ester C₉H₁₅Br₆O₄P formerly used to flameproof clothes and especially children's nightclothes until it was found to cause cancer in animals.

plural of tri

Initialism of Toxic Release Inventory. / (artificial intelligence, US) Initialism of Toyota Research Institute.