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.
As a provider of milk, and due to cows careful tending of their calves, the cow was a universal symbol of motherhood, and so Hathor became goddess of motherhood, gaining titles such as 'The Great Cow Who Protects Her Child' and 'Mistress of the Sanctuary of Women.'.