polyprotic
/ˌpɒlɪˈprəʊtɪk/Chemistry
adjective
Of an acid: capable of donating more than one proton to a base; polybasic. Also occasionally: (of a base) capable of accepting more than one proton from an acid.
Origin
1940s. From poly- + prot- + -ic. Compare earlier monoprotic, also protic.