A bone spur (osteophyte) is a bony growth formed on normal bone. Most people think of something sharp when they think of a spur, but a bone spur is just extra bone. It's usually smooth, but it can cause wear and tear or pain if it presses or rubs on other bones or soft tissues such as ligaments, tendons, or nerves in the body.
An immediate or cancel order (IOC) is an order to buy or sell a security that must be executed immediately, and any portion of the order that cannot be immediately filled is cancelled.
Canceling a purchase on eBay can be tricky since the sale is considered final even if you haven't yet paid. EBay has a formal cancellation process that allows you to contact the seller directly and ask him to cancel the order, but the seller must cooperate for the process to work. If the seller refuses, you must either go through with the purchase or risk getting a strike against your eBay account.