Stratous is valid Scrabble Word

Is stratous a scrabble word?
Official Scrabble Players Dictionary YES
Official Tournament and Club Word List YES
Collins Scrabble Words YES
Is stratous valid Words with Friends?
Words with Friends YES

8 letters word
8 points in Scrabble
9 points in WWF

Definitions for STRATOUS in dictionary:

NOUN [PLURAL STRAÂ·TA, STRAÂ·TUMS.]:

a layer of material, naturally or artificially formed, often one of a number of parallel layers one upon another: a stratum of ancient foundations.
one of a number of portions or divisions likened to layers or levels: an allegory with many strata of meaning.
a single bed of sedimentary rock, generally consisting of one kind of matter representing continuous deposition.
a layer of tissue; lamella.
(in a plant community) a layer of vegetation, usually of the same or similar height.
a layer of the ocean or the atmosphere distinguished by natural or arbitrary limits.
a level or grade of a people or population with reference to social position, education, etc.: the lowest stratum of society.
(in stratificational grammar) a major subdivision of linguistic structure.

ADJECTIVE:

in strata, layered, also STRATOSE
of stratus

OTHER DEFINITIONS:

stratal

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