Definition of pipe for English Language Learners. : 1  a long, hollow tube for carrying water, steam, gas, etc. : 2  a tube with a small bowl at one end that is used for smoking tobacco. : 3  a musical instrument that is in the shape of a tube, has holes along the top, and is played by blowing.
The Blood of Olympus (mentioned) Lupa is the immortal Roman wolf goddess who trains Roman demigods in the ways of Rome. She trains the demigods at the Wolf House, then sends them to Camp Jupiter where they can join the Twelfth Legion.
The Lost Hero. Hera, Queen of the Gods, gave Jason Grace, son of Jupiter, over to a she-wolf named Lupa in the Wolf House. Years later, Jason is reunited with his sister Thalia Grace and they find Hera trapped in the house.