Definition of Medithermal in US English:

Medithermal

adjective

Ecology Archaeology
  • Designating or relating to the most recent climatic phase in the Holocene of North America, following the Altithermal phase (from about 2500 b.c.) and characterized by a gradually cooling climate in central and western regions.

Origin

1940s. From medi- + thermal. Compare Anathermal and Altithermal.

Pronunciation

Medithermal

/ˌmiːdɪˈθəːml/