weed

noun

1. a valueless plant growing wild, especially one that grows on cultivated ground to the exclusion or injury of the desired crop.
2. any undesirable or troublesome plant, especially one that grows profusely where it is not wanted: The vacant lot was covered with weeds.
3. Informal. a cigarette or cigar.
4. Slang. a marijuana cigarette.
5. a thin, ungainly person or animal.
6. a wretched or useless animal, especially a horse unfit for racing or breeding purposes.
7. the weed,
   1. Informal.tobacco.
   2. Slang.marijuana.