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1610s, from an Algonquian language, probably Narragansett moos or Abenaki moz (cf. Penobscot muns, Ojibwa mooz, Unami Delaware /mo:s/), said by early sources to be from moosu "he strips off," in reference to the animals' stripping bark for food.
[Korean War armed forces; fr Japanese musume, ''girl'']