polyacid

1 of 2

noun

poly·​ac·​id ˈpäl-ē-ˌas-əd 

1

: an acid (as phosphoric acid) having more than one acid hydrogen atom

2

: an acid of a large group of oxygen-containing acids

polyacid

2 of 2

adjective

: able to react with more than one molecule of a monoacid to form a salt

—used especially of bases