Decalescent is valid Scrabble Word

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

Definitions for DECALESCENT in dictionary:

Find what other words can be done using letters: "decalescent"
https://scrabble-word.com/finder/decalescent
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