weed (Noun) — Any plant that crowds out cultivated plants.
weed (Noun) — A black band worn by a man (on the arm or hat) as a sign of mourning.
weed (Noun) — A street name for marijuana.
weed (Noun) — A person who is physically weak and ineffectual.
weed (Verb) — Clear of weeds. ex. "weed the garden"
weed (Verb) — Eliminate urine. ex. "Again, the cat had weed on the expensive rug"