refluxing

verb
  1. 1

    To flow back or return.

    โ€œthe refluxing tideโ€

  2. 2

    To boil a liquid in a vessel having a reflux condenser

noun
  1. 1

    An act of boiling with a reflux condenser.

Source: https://en.wiktionary.org/wiki/reflux, https://en.wiktionary.org/wiki/refluxing