phosphonates

/F AA1 S F AH0 N EY1 T S/
noun
  1. 1

    Any salt or ester of a phosphonic acid; many of its derivatives have important biological activity.

verb
  1. 1

    To react with a phosphonic acid derivative

Source: https://en.wiktionary.org/wiki/phosphonate, https://en.wiktionary.org/wiki/phosphonates