phlogiston

/flษ™(สŠ)หˆdส’ษชstษ’n/

IPA: /F L AA1 JH IH0 S T AA0 N/

noun
  1. 1

    The hypothetical fiery principle formerly assumed to be a necessary constituent of combustible bodies and to be given up by them in burning.

Source: https://en.wiktionary.org/wiki/phlogiston