Mesembryanthemum is valid word

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

Definitions for MESEMBRYANTHEMUM in dictionary:

Words that contain MESEMBRYANTHEMUM

mesembryanthemums33
Find what other words can be done using letters: "mesembryanthemum"
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