What is the meaning of weed?

noun

• Any plant that crowds out cultivated plants.
• A black band worn by a man (on the arm or hat) as a sign of mourning.
  • synonyms: mourning band
• Street names for marijuana.
  • synonyms: pot, grass, green goddess, dope, gage, sess, sens, smoke, skunk, locoweed, Mary Jane

verb

• Eliminate urine.
  • usage: "Again, the cat had made on the expensive rug"
  • synonyms: make, urinate, piddle, puddle, micturate, piss, pee, pee-pee, make water, relieve oneself, take a leak, spend a penny, wee, wee-wee, pass water
• Clear of weeds.
  • usage: "weed the garden"