Periost is valid Scrabble Word

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

7 letters word
9 points in Scrabble
10 points in WWF

Definitions for PERIOST in dictionary:

NOUN:

a tough fibrous membrane covering the surface of bones, also PERIOSTEUM
thick fibrous two-layered membrane covering the surface of bones

Words related to PERIOST

periosts10

Words that contain PERIOST

periosts10 periostea11 periosteal12 periosteum14 periostitic15 periostitis13 periostites13 periostracum18 periostitises15 periostracums19 periostitides16

Find what other words can be done using letters: "periost"
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