carpenter's level meaning

Noun: carpenter's level
1. A straight bar of light metal with a spirit level in it
Derived forms: carpenter's levels
Type of: bar
[Architecture]
An instrument used by a carpenter to determine a horizontal or a vertical line; consists of a spirit level set in a straight bar of wood or metal.
carpenter's level
[Design engineering]
"A bar, usually of aluminum or wood, containing a spirit level."