Cyclooxygenase is valid Scrabble Word

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

Definitions for CYCLOOXYGENASE in dictionary:

Words that contain CYCLOOXYGENASE

cyclooxygenases33
Find what other words can be done using letters: "cyclooxygenase"
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