Synteresis is valid Scrabble Word

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

Definitions for SYNTERESIS in dictionary:

Words related to SYNTERESIS

syntereses13
Find what other words can be done using letters: "synteresis"
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