Yes, MENISCUSES is a Scrabble word!

Letter values in Scrabble US: M 3, E 1, N 1, I 1, S 1, C 3, U 1, S 1, E 1, S 1.

Is it a valid word?

MENISCUSES is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

(anatomy) a disk of cartilage that serves as a cushion between the ends of bones that meet at a joint
(optics) a lens that is concave on one side and convex on the other
(physics) the curved upper surface of a nonturbulent liquid in a vertical tube

Also: semilunar cartilage.