Schistous is valid Scrabble Word

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

9 letters word
14 points in Scrabble
15 points in WWF

Definitions for SCHISTOUS in dictionary:

ADJECTIVE:

of or pertaining to schist; having the structure of a schist, also SCHISTOSE
Of or pertaining to schist; having the structure of a schist.

Words related to SCHISTOUS

schist11

How to use SCHISTOUS in a sentence

This was Ambialet, so called from the extraordinary loop which the Tarn forms here in consequence of the mass of schistous rock which obstructs its direct channel.
Here the lower formation was schistous, the upper calcareous.
And these prodigious slabs of gneiss now lay amidst schistous marl and calcareous rock.
It stands upon a mass of schistous rock about fifty feet above the river.

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