Retardancy is valid Scrabble Word

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

10 letters word
16 points in Scrabble
17 points in WWF

Definitions for RETARDANCY in dictionary:

ADJECTIVE:

(chiefly of a synthetic or treated fabric or substance) not readily susceptible to fire
a fabric or substance that prevents or inhibits something, especially the outbreak of fire

OTHER DEFINITIONS:

The degree of being retardant

Similar words containing TARDAN without suffix cy and without prefix re

retardant10 retardants11 ritardando12 retardance13 ritardandi12 ritardandos13 retardances14 retardancies15

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