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megatherm

[meg-uh-thurm]
noun
  1. a plant requiring a constant high temperature and abundant moisture for growth.
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Origin of megatherm

First recorded in 1875–80; mega- + therm
Related formsmeg·a·ther·mic, meg·a·ther·mal, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018