Uriniferous tubules!

"The nephron and the collecting duct together are referred to as the uriniferous tubules." -from my Phyiology lab book.

Love this word: "uriniferous." It's an adjective. And it "conveys urine"--as in, "denoting the tubules of the kidney." Har har. Love it.

The hobo walked past, leaving an unmistakable uriniferous odor in his wake.

San Francisco is often uriniferous in many parts of town.

Before a child is potty trained, every location upon which it's tush has been in contact with will retain a uriniferous odor.

Not even sure if I'm using the word right, but it's fun using it.