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Webster's 1913 Dictionary

PHOSPHONIC

Phos *phon "ic, a. Etym: [Phosphoric + sulphonic. ] (Chem. )

 

Defn: Pertaining to, or designating, certain derivatives of phosphorous acid containing a hydrocarbon radical, and analogous to the sulphonic acid.

 

New American Oxford Dictionary

phosphonic acid

phos phon ic ac id |fäsˈfänik fɑsˌfɑnɪk ˈæsɪd | ▶noun Chemistry a crystalline acid obtained by the reaction of phosphorus trioxide with water. [A dibasic acid; chem. formula: HPO (OH ) 2. ] DERIVATIVES phos pho nate |ˈfäsfəˌnāt |noun ORIGIN late 19th cent.: phosphonic from phospho- ‘relating to phosphorus, ’ on the pattern of sulfonic.

 

Oxford Dictionary

phosphonic acid

phosphonic acid |fɒsˈfɒnɪk | ▶noun [ mass noun ] Chemistry a crystalline acid obtained by the reaction of phosphorus trioxide with water. ●A dibasic acid; chem. formula: HPO (OH ) 2. ORIGIN late 19th cent.: phosphonic from phospho- ‘relating to phosphorus ’, on the pattern of sulphonic .