In climatology, the term megathermal (or less commonly, macrothermal)'s sometimes used as a synonym for "tropical." The word megathermal's derived from two Greek words meaning "having great heat." In order for a particular place to qualify as having a megathermal climate, every single month out of the year must've an average temperature of 18°C or above. Megathermal climates are sometimes split into two temperature-based subsets — equatorial and tropical (the latter used here in the s… (More on Megathermal)