Definition of mesothermal in US English:

mesothermal

adjective

  • 1Chiefly Ecology. Of an environment: characterized by moderate temperatures; (of an organism) inhabiting such an environment.

  • 2Geology. Of, relating to, or designating mineral and ore deposits formed by hydrothermal action at intermediate temperature and pressure.

  • 3Physics. Of the speed of an object in a plasma: less than that of the ambient electrons but higher than that of the ions.

Origin

Early 20th century; earliest use found in Bulletin of the Torrey Botanical Club. From meso- + thermal.

Pronunciation

mesothermal

/ˌmɛsə(ʊ)ˈθəːml/