Rarefactive is valid Scrabble Word

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

11 letters word
19 points in Scrabble
21 points in WWF

Definitions for RAREFACTIVE in dictionary:

VERB:

make or become less dense or solid

ADJECTIVE:

causing rarefaction

How to use RAREFACTIVE in a sentence

A piece of bone undergoing rarefactive ostitis is redder than normal, and the openings of the Haversian canals are distinctly increased in size.
It may occur as a result of, or, as we have just shown, exist simultaneously with the condition of, diffuse rarefactive ostitis.
The erosion of the cartilage on its central ridge is most marked, and the porous appearance of the bone thus uncovered points to the existence within it of a rarefactive ostitis.

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