What are lines call when they go around earth in a east-west direction

Horizontal lines, like the horizon. That's how I remember it, anyways. Or on a globe, latitude lines. My teacher always taught us "FAT-itude lines."

Latitude and Longitude: Your Global Address
Every location on earth has a global address. Because the address is in numbers, people can communicate about location no matter what language they might speak. A global address is given as two numbers called coordinates. The two numbers are a location's latitude number and its longitude number ("Lat/Long").