Triaconter is valid Scrabble Word

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

Definitions for TRIACONTER in dictionary:

Words related to TRIACONTER

triaconters13
Find what other words can be done using letters: "triaconter"
https://scrabble-word.com/finder/triaconter
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