(ˈ)trī+ adjective
Etymology: tri- + basic
1. : having three hydrogen atoms capable of replacement by basic atoms or radicals — used of acids (as phosphoric acid)
2. : containing three atoms of a univalent metal or their equivalent
tribasic sodium phosphate Na 3 PO 4
3. : having three basic hydroxyl groups : able to react with three molecules of a monobasic acid — used of bases and basic salts
• tri·basicity |trī+ noun