Merriam-Webster Collegiate Dictionary - weed

 I. noun  Etymology: Middle English, from Old English weod ~, herb; akin to Old Saxon wiod ~  Date: before 12th century  1.  a.  (1) a plant that is not valued where it is growing and is usually of vigorous growth; especially one that tends to overgrow or choke out more desirable plants  (2) a ~y growth of plants  b. an aquatic plant; especially sea~  c.  (1) tobacco products  (2) marijuana  2.  a. an obnoxious growth, thing, or person  b. something like a ~ in detrimental quality; especially an animal unfit to breed from  II. verb  Date: before 12th century  intransitive verb to remove ~s or something harmful  transitive verb  1.  a. to clear of ~s ~ a garden  b.  (1) to free from something hurtful or offensive  (2) to remove the less desirable portions of  2. to get rid of (something harmful or superfluous) — often used with out ~ out the troublemakers  III. noun  Etymology: Middle English wede, from Old English w?d, gew?de; akin to Old Norse vath cloth, clothing and perhaps to Lithuanian austi to weave  Date: before 12th century  1. garment — often used in plural  2.  a. dress worn as a sign of mourning (as by a widow) — usually used in plural  b. a band of crape worn on a man's hat as a sign of mourning — usually used in plural