Yes, MENINGITIS is a Scrabble word!

Letter values in Scrabble US: M 3, E 1, N 1, I 1, N 1, G 2, I 1, T 1, I 1, S 1.

Is it a valid word?

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

infectious disease characterized by inflammation of the meninges (the tissues that surround the brain or spinal cord) usually caused by a bacterial infection; symptoms include headache and stiff neck and fever and nausea