IPA: //ˌhoʊmiˈθɜrmi//
KK: /hoʊˈmiːəˌθɜrmi/
The condition of maintaining a constant body temperature regardless of the environment.
Many mammals exhibit homeothermy, allowing them to thrive in various climates.
Homeothermy is formed from "homeo-" (from Greek "homoios", meaning similar or same) and "thermy" (from Greek "thermos", meaning heat). The term refers to the ability of an organism to maintain a stable internal body temperature regardless of external conditions, hence being similar in temperature.
Think of 'similar' ('homeo-') temperatures being maintained by an organism, which is what homeothermy means.