英语词源字典 - 在线词源网站

marasmus (n.)[marasmus 词源字典]: "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" (see morbid). Maras (n.) evidently in the same sense is attested from mid-15c. Related: Marasmic.[marasmus etymology, marasmus origin, 英语词源]
marcescent (adj.): "withering," 1727, from Latin marcescentem (nominative marcescens), present participle of marcescere "to wither, languish, droop, decay, pine away," inchoative of marcere "to wither, droop, be faint," from PIE root *merk- "to decay."
wither (v.): 1530s, alteration of Middle English wydderen "dry up, shrivel" (late 14c.), intransitive, apparently a differentiated and special use of wederen "to expose to weather" (see weather (v.)). Compare German verwittern "to become weather-beaten," from Witter "weather." Transitive sense from 1550s. Related: Withered; withering; witheringly.