Yes, ASCITIC is a Scrabble word!

Letter values in Scrabble US: A 1, S 1, C 3, I 1, T 1, I 1, C 3.

Is it a valid word?

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

of or relating to or resulting from an abnormal accumulation of protein and electrolyte rich fluid in the peritoneal cavity