Arcsin is valid Words with Friends

Is arcsin a scrabble word?
Official Scrabble Players Dictionary NO
Official Tournament and Club Word List NO
Collins Scrabble Words NO
Is arcsin valid Words with Friends?
Words with Friends YES

Definitions for ARCSIN in dictionary:

Words that contain ARCSIN

arcsine9 arcsins9 arcsines10
Find what other words can be done using letters: "arcsin"
https://scrabble-word.com/finder/arcsin
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