Fractostratus is valid Scrabble Word

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

Definitions for FRACTOSTRATUS in dictionary:

Words related to FRACTOSTRATUS

fractostrati17
Find what other words can be done using letters: "fractostratus"
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