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ectotherm ecÂ·toÂ·therm (Äk'tÉ-thÃ»rm') n. An organism that regulates its body temperature largely by exchanging heat with its surroundings; a poikilotherm.
Define ectoderm: the outermost of the three primary germ layers of an embryo that is the source of various tissues and structures (such as theâ¦ the outermost of the three primary germ layers of an embryo that is the source of various tissues and structures (such as the epidermis, theâ¦ See the full definition