Yes, CAROTID is a Scrabble word!

Letter values in Scrabble US: C 3, A 1, R 1, O 1, T 1, I 1, D 2.

Is it a valid word?

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

of or relating to either of the two major arteries supplying blood to the head and neck