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phosphonic acid Syllabification: phos·phon·ic ac·id
Pronunciation: /fäsˌfänik ˈasid/

Definition of phosphonic acid in English:


A crystalline acid obtained by the reaction of phosphorus trioxide with water.
Example sentences
  • The phosphoric or phosphonic acid ester formed with the enzyme is extremely stable and is hydrolyzed very slowly.
  • A Hoffman rearrangement employing sodium hypobromite yielded the amine which was acid hydrolysed to obtain crude 2-aminoindan - 2 - phosphonic acid.
  • The abscission process was also induced in vivo by embrioctomy or 2-chloroethyl phosphonic acid treatment in fruitlets and by deblading in leaves.


Late 19th century: phosphonic from phospho- 'relating to phosphorus', on the pattern of sulfonic.



Pronunciation: /ˈfäsfəˌnāt/
Example sentences
  • Phosphonates are known to be present in oligotrophic marine systems, but have not previously been considered to be bioavailable to marine diazotrophs.
  • The interactions of two antiviral, acyclic nucleoside phosphonates, adefovir and cidofovir, with xenobiotic transporters was studied in intact killifish.

Definition of phosphonic acid in:

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Pronunciation: fôrˈtisəˌmō
(especially as a direction) very loud or loudly