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trier a person or thing that tries, samples, or tests.
trifacial see trigeminal.
trifid divided or cleft into three distinct lobes, as the leaves of certain plants.
trifle something that has very little value or importance. [6 definitions]
trifling of little importance, meaning, or value; slight; trivial. [2 definitions]
trifocal of eyeglasses, having three lenses of different focal lengths. [2 definitions]
trifoliate having three leaves, leaflets, lobes, or the like. [2 definitions]
trifoliolate having three leaflets, or having leaves that have three leaflets, as clover.
trig (informal) trigonometry.
trigeminal of or pertaining to the trigeminal nerve.
trigeminal nerve either one of the fifth pair of cranial nerves that conduct impulses from the head and face to the brain.
trigger a small lever that when pressed or pulled causes a firearm to fire, or a similar lever on another device or machine. [4 definitions]
trigger finger the finger used to pull the trigger of a gun, usu. the index finger.
trigger-happy (informal) ready to use force, esp. by firing a gun, at the slightest provocation, regardless of consequences. [2 definitions]
triglyceride an ester derived from glycerol and three fatty acid radicals which is the main component of fats and oils.
trigonometric function a function, such as sine, cosine, or tangent, expressed as the ratio of different sides of a right triangle.
trigonometry the branch of mathematics concerned with the relationships between sides and angles of right triangles, and with calculations based on these relationships.
trihedral having three planes that meet in a point. [2 definitions]
trihedron a figure formed by three planes that meet in a point; trihedral.
trike (informal) a tricycle.
trilateral three-sided.