noun

• (countable) Any plant unwanted at the place where and at the time when it is growing.
  "If it isn't in a straight line or marked with a label, it's a weed."
• (uncountable, archaic or obsolete) Underbrush; low shrubs.
  "one rushing forth out of the thickest weed"
• A drug or the like made from the leaves of a plant.
  "And I predict you will laugh harder than ever. I’m not saying I’m any funnier. I’m saying weed is now legal in D.C."
• A drug or the like made from the leaves of a plant.

verb

• (transitive) To remove unwanted vegetation from a cultivated area (especially grass).
  "I weeded my flower bed."
• (figurative, transitive) To pilfer the best items from a collection.
  "She now regretted much having had the case taken to the duke's, for surely it might have been weeded to very good purpose, and no one the wiser."
• (library science, transitive) To systematically remove materials from a library collection based on a set of criteria.
  "We usually weed romance novels that haven't circulated in over a year."

noun

• (archaic) A garment or piece of clothing.
  "Lie here ye weedes that I diſdaine to weare, This compleat armor, and this curtle-axe Are adiuncts more beſeeming Tamburlaine."
• (archaic) Clothing collectively; clothes, dress.
  "His mother o'er her barm-cloth wide / Gazed forward somewhat timidly / The new-comer's bright weed to see."
• (archaic) An article of dress worn in token of grief; a mourning garment or badge.
  "He wore a weed on his hat."
• (archaic) A hatband.
  "[…] he was beat and retreated back to his old encampment with his weed on his hat dragging on the ground, with the loss of more than nineteen hundred men; […]"

noun

• (Scotland) A sudden illness or relapse, often attended with fever, which befalls those who are about to give birth, are giving birth, or have recently given birth or miscarried or aborted.
  "The patient […] aborted between the second and third month; […] felt herself so well on the second day after, that she went to the washing-green; and, on her return home in the evening, was seized with a violent rigor, which, by herself and those around her, was considered as the forerunner of a weed."
• (Scotland) Lymphangitis in a horse.