Also found in: Thesaurus, Medical, Wikipedia.
Related to metaphosphoric acid: pyrophosphoric acid
A colorless glassy polymeric phosphoric acid, (HPO3)n, that is highly deliquescent and forms phosphoric acid upon addition of water, used as a dehydrating agent, phosphorylating agent, and in dental cements.
(Elements & Compounds) a glassy deliquescent highly polymeric solid, used as a dehydrating agent. Formula: (HPO3)n. See also polyphosphoric acid