Definition of phlegmatous in US English:

phlegmatous

adjective

Medicine
rare
  • Inflammatory; phlegmonous.

Origin

Mid 19th century; earliest use found in The Lancet. Either from post-classical Latin phlegmat- + -ous, or from ancient Greek ϕλέγματ-, stem of ϕλέγμα phlegm + -ous, after phlegmasia.

Pronunciation

phlegmatous

/ˈflɛɡmətəs/