| ̷ ̷ ̷ ̷(ˌ) ̷ ̷| ̷ ̷ ̷ ̷- noun
or lig·no·sulfonic acid |lignō+...-
Etymology: International Scientific Vocabulary lignin or lign- + sulfonic
: any of various sulfonic acids derived from lignin ; especially : those found as calcium or other soluble salts in sulfite liquor and used chiefly in tanning, as dispersing agents, and as raw materials for the manufacture of vanillin