noun
also lack·moid ˈlakˌmȯid
( -s )
Etymology: lacmoid, International Scientific Vocabulary lacm- (from lacmus ) + -oid; probably originally formed as German lakmoid; lackmoid, alteration of lacmoid
: a violet-blue dye resembling litmus that is made by the action of nitrites on resorcinol and is used as an indicator in titration