STRATUM
Here are the details, including the meaning, point value, and more about the Scrabble word
STRATUM. Below
stratum is worth 17 points in the game of Scrabble
Definitions for the word, stratum
(n.) A bed of earth or rock of one kind, formed by natural causes, and consisting usually of a series of layers, which form a rock as it lies between beds of other kinds. Also used figuratively.
(n.) A bed or layer artificially made; a course.