Definition of metaboric acid in US English:

metaboric acid

noun

Chemistry
  • The least hydrated of the oxoacids of boron, obtained by heating (ortho)boric acid, and occurring in several forms with the general formula HBO₂; especially B₃O₃(OH)₃.

Origin

Late 19th century; earliest use found in Charles Bloxam (1831–1887), chemist.