marasmus (n.)

"wasting away of the body," 1650s, Modern Latin, from Greek marasmos "a wasting away, withering, decay," from marainein "to quench, weaken, wither," from PIE root *mer- "to rub away, harm." Maras (n.) evidently in the same sense is attested from mid-15c. Related: Marasmic.

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