Yes, VIROID is a Scrabble word!

Letter values in Scrabble US: V 4, I 1, R 1, O 1, I 1, D 2.

Is it a valid word?

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

the smallest of viruses; a plant virus with its RNA arranged in a circular chromosome without a protein coat