Yes, ETIOLATION 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, O 1, N 1.

Is it a valid word?

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

a pale and sickly appearance
the act of weakening by stunting the growth or development of something
(botany) the act of causing a plant to develop without chlorophyll by growing it without exposure to sunlight