Yes, PTERYGIUMS is a Scrabble word!

Letter values in Scrabble US: P 3, T 1, E 1, R 1, Y 4, G 2, I 1, U 1, M 3, S 1.

Is it a valid word?

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

either of two thickened triangular layers of conjunctiva extending from the nasal edge of the eye to the cornea; it arises from irritation of the pinguecula