Yes, CHINED is a Scrabble word!

Letter values in Scrabble US: C 3, H 4, I 1, N 1, E 1, D 2.

Is it a valid word?

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

cut through the backbone of an animal
raise oneself while hanging from one's hands until one's chin is level with the support bar

Also: chin up.