American Heritage® Dictionary of the English Language, Fourth Edition
- n. A narrow strip of wood with a plumb line hanging from it, used to test verticality.
Century Dictionary and Cyclopedia
- n. A narrow board with parallel edges having a straight line drawn through the middle, and a string carrying a metal weight attached at the upper end of the line. It is used by masons, bricklayers, carpenters, etc., for determining a vertical.
GNU Webster's 1913
- n. a narrow board with a plumb line, used by builders and carpenters.
- n. a plumb line attached to a narrow board
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