Platinous is valid Scrabble Word

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

9 letters word
11 points in Scrabble
15 points in WWF

Definitions for PLATINOUS in dictionary:

ADJECTIVE:

of or containing platinum in the divalent state
of or containing platinum, esp in the divalent state
Of, pertaining to, or containing, platinum; -- used specifically to designate those compounds in which the element has a lower valence, as contrasted with the platinic compounds; as, platinous chloride (PtCl2).

OTHER DEFINITIONS:

of, relating to, or containing platinum especially with a valence of twoâ€”compare platinic

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