pissabed

noun3

1. •
   Any dandelion (Taraxacum officinale), formerly much used for its diuretic properties.

   • Of flowers there was no trace, save of the flowers that plant themselves, or never die […] The chief of these was the pissabed. — 1953
2. •
   (dialect) Any of various other wild plants with diuretic properties; bluet, oxeye daisy, etc.
3. •
   (slang, no longer used) A bedwetter.