Extremal is valid Scrabble Word

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

8 letters word
17 points in Scrabble
19 points in WWF

Definitions for EXTREMAL in dictionary:

NOUN:

a clause which limits recursion
clause in a recursive definition

OTHER DEFINITIONS:

clause in a recursive definition that specifies that no items other than those generated by the stated rules fall within the definition

Words related to EXTREMAL

extremals18

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