afˈthid. ə lˌīt, apˈth- noun
( -s )
Etymology: Greek aphthitos indestructible (from a- a- (II) + — assumed — phthitos, verbal of phthiein to waste away) + hal-, hals salt + English -ite — more at phthisis , salt
: a mineral (K,Na) 3 Na(SO 4 ) 2 consisting of potassium sodium sulfate occurring massive or in white rhombohedral crystals