metaphosphoric acid

noun

meta·​phos·​pho·​ric acid ˌme-tə-ˌfäs-ˈfȯr-ik- 

-ˈfär-;

-ˈfäs-f(ə-)rik-

: a glassy solid acid HPO₃ or (HPO₃)_n formed by heating orthophosphoric acid

Word History

First Known Use

1833, in the meaning defined above

Medical Definition

metaphosphoric acid

noun

meta·​phos·​pho·​ric acid ˌmet-ə-ˌfäs-ˌfȯr-ik-, -ˌfär-; -ˌfäs-f(ə-)rik- 

: a glassy solid acid HPO₃ or (HPO₃)_n formed by heating orthophosphoric acid but usually obtained in the form of salts