Trig
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late 19th century: abbreviation.
wiktionary
From Middle English trig, tryg, from Old Norse tryggr(“loyal, faithful, true”), from Proto-Germanic *triwwiz(“loyal, faithful, true”). Cognate with Old English trīewe(“faithful, loyal, true”). More at true.
Clipping of trigonometry.
See trigger.
Compare Danish trykke(“to press”).
Clipping.
etymonline
trig (adj.)
"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.
