waif
1376, "unclaimed property, flotsam, stray animal," from Anglo-Norm. waif, gwaif (1223) "ownerless property," probably from a Scand. source akin to O.N. veif "waving thing, flag," from P.Gmc. *waif-, from PIE *weip- "to turn, vacillate, tremble ecstatically." Cf. M.L. waivium "thing thrown away by a thief in flight." A Scot./northern Eng. parallel form was wavenger (1493). Meaning "person (especially a child) without home or friends" first attested 1784, from legal phrase waif and stray (1624). Neglected children being uncommonly thin, the word tended toward this sense. Connotations of "fashionable, small, slender woman" began 1991 with application to childishly slim supermodels such as Kate Moss.