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A thermocline (also known as the thermal layer or the metalimnion in lakes) is a thin but distinct layer in a large body of fluid (e.g. water, such as an ocean or lake, or air, such as an atmosphere) in which temperature changes more rapidly with depth than it does in the layers above or below.
Medical Definition of PHOSPHOCREATINE. : a compound C4H10N3O5P of creatine and phosphoric acid that is found especially in vertebrate muscle where it is an energy source for muscle contractionâcalled also creatine phosphate. a compound C4H10N3O5P of creatine and phosphoric acid that is found especially in vertebrate muscle where it is an energy source for muscle contraction. ADVERTISEMENT.