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Lean Muscle Mass. Lean muscle is a concept related to lean body mass, which is the content of the body minus fat. Lean body mass is used to calculate basal metabolic rate.Lean muscle is less of a scientific term and more a term of art that refers to muscle that is independent of, and not obscured by, fat.ean Muscle Mass. Lean muscle is a concept related to lean body mass, which is the content of the body minus fat. Lean body mass is used to calculate basal metabolic rate.
Webster Dictionary(0.00 / 0 votes)Rate this definition: Lean(verb) to conceal. Lean(verb) to incline, deviate, or bend, from a vertical position; to be in a position thus inclining or deviating; as, she leaned out at the window; a leaning column.