polyacid

[ pol-ee-as-id ]

adjective

1. having more than one replaceable hydrogen atom.
2. capable of reacting with more than one equivalent weight of an acid.

noun

1. an acid having more than one replaceable hydrogen atom.
2. an oxyacid containing the equivalent of extra molecules of its anhydride, as the polysulfuric acids, H 2 S 2 O 7 or H 2 SO 4 ⋅SO 3 , and H 2 S 3 O 1 0 or H 2 SO 4 ⋅2SO 3 .

Word History and Origins

Origin of polyacid¹

First recorded in 1855–60; poly- + acid