Tachyphylaxis is valid Scrabble Word

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

Definitions for TACHYPHYLAXIS in dictionary:

Words related to TACHYPHYLAXIS

tachyphylaxes36
Find what other words can be done using letters: "tachyphylaxis"
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