What is the meaning of Anvil?

A heavy iron block used in the blacksmithing trade as a surface upon which metal can be struck and shaped.

The incus bone in the middle ear.

A stone or other hard surface used by a bird for breaking the shells of snails.

The non-moving surface of a micrometer against which the item to be measured is placed.

A horizontal-topped mass of cloud, shaped like a blacksmith's anvil, that forms before a thunderstorm.

To fashion on, or as if on, an anvil.

Source: wiktionary.org