One of the mysteries of the English language finally explained.
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.
Early 20th century; earliest use found in Bulletin of the Torrey Botanical Club. From meso- + thermal.
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