Yes, ETIOLATING is a Scrabble word!

Letter values in Scrabble US: E 1, T 1, I 1, O 1, L 1, A 1, T 1, I 1, N 1, G 2.

Is it a valid word?

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

make weak by stunting the growth or development of
bleach and alter the natural development of (a green plant) by excluding sunlight
make pale or sickly