8 letters · 11 points in Scrabble
noun a volatile substance; a substance that changes readily from solid or liquid to a vapor
adjective evaporating readily at normal temperatures and pressures
adjective liable to lead to sudden change or violence
originFrom Middle French volatile, from Latin volātilis (“flying; swift; temporary; volatile”), from volō (“to fly”).
Etymology from Wiktionary, CC BY-SA 3.0