"smart, trim," c. 1200, from Old Norse tryggr "firm, trusty, true," from Proto-Germanic *treuwaz "having or characterized by good faith," from PIE *drew-o-, a suffixed form of the root *deru- "be firm, solid, steadfast." A Scottish and northern word only until 19c. Related: Trigness.
trig (n.)
1895 as a shortening of trigonometry.
the trig corporal in his jaunty cap
Trier
trifecta
trifid
trifle
trifocals
trig
trigeminal
trigger
triglyceride
trigonometric
trigonometry
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