Yes, DOSSALS is a Scrabble word!

Letter values in Scrabble US: D 2, O 1, S 1, S 1, A 1, L 1, S 1.

Is it a valid word?

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

an ornamental hanging of rich fabric hung behind the altar of a church or at the sides of a chancel