Sine is valid Scrabble Word

Is sine a scrabble word?
Official Scrabble Players Dictionary YES
Official Tournament and Club Word List YES
Collins Scrabble Words YES
Is sine valid Words with Friends?
Words with Friends YES

Definitions for SINE in dictionary:

Words related to SINE

sined6 sines5 sinical9 sining7 syne7

How to use SINE in a sentence

Find what other words can be done using letters: "sine"
https://scrabble-word.com/finder/sine
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