[¦wən ¦tü ¦fȯr ¦ben‚zēn·trī¦kär·bäk¦sil·ik ′as·əd] (organic chemistry) C6H3(COOH)3 Crystals with a melting point of 218-220°C; crystallizes from acetic acid or from dilute alcohol; used as an intermediate in the preparation of adhesives, plasticizers, dyes, inks, and resins.