Pertaining to, derived from, or designating, an acid
   formerly obtained by fusing salicin with potassium hydroxide, and now
   made in large quantities from phenol (carbolic acid) by the action of
   carbon dioxide on heated sodium phenolate. It is a white crystalline
   substance. It is used as an antiseptic, and in its salts in the
   treatment of rheumatism. Called also hydroxybenzoic acid.