How do you spell Anvil

Available Definitions:
1)  n. - An iron block, usually with a steel face, upon which metals are hammered and shaped.
2)  n. - Anything resembling an anvil in shape or use.
3)  n. - the incus. See Incus .
4)  v. t. - To form or shape on an anvil; to hammer out; as, anviled armor.