metaphosphoric acid

noun Chemistry.

1. an acid, HPO3, derived from phosphorous pentoxide, and containing the smallest amount of water of the phosphoric acids.

noun

1. a glassy deliquescent highly polymeric solid, used as a dehydrating agent. Formula: (HPO 3) nSee also polyphosphoric acid

n.

1. An inorganic compound used as a dehydrating agent and in dental cements.