Yes, trig is a Scrabble word!
...and is worth 5 points in Scrabble, and 6 points in Words with Friends
trig
Adjective
1. Neat and smart in appearance
Noun
1. The mathematics of triangles and trigonometric functions
What Scrabble words can I make with the letters in trig?
4 Letter Words
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3 Letter Words
2 Letter Words