phlo·gis·ton 
(flō-jĭstŏn′, -tən)
(flō-jĭstŏn′, -tən)n.
A hypothetical substance formerly thought to be a volatile constituent of all combustible substances, released as flame in combustion.
[From Greek, neuter of phlogistos, inflammable, from phlogizein, to set on fire, from phlox, phlog-, flame; see bhel-1 in the Appendix of Indo-European roots.]
- histochemically
- histochemistry
- histocompatibility
- histocompatibility antigen
- histocompatible
- histodialysis
- histogenesis
- histogenetic
- histogenetically
- histogenic
- histogenically
- histogram
- histologic
- histological
- histologically
- histologist
- histology
- histolysis
- histolytic
- histomoniasis
- histone
- histopathologic
- histopathological
- histopathologically
- histopathologist