A ______________________ foot is defined as a board or plank that is 1" thick x 12" wide x 12" long.

A board foot is specifically defined as a unit of measure for lumber that quantifies volume. It refers to a piece of lumber that is 1 inch thick, 12 inches wide, and 12 inches long. This measurement is important in the forestry and lumber industries as it helps in estimating the amount of wood produced or needed for various projects.

The concept behind the board foot measurement is to provide a standardized way to express the volume of wood that can be sawn into usable pieces for construction or other uses. This makes the term 'board foot' the most accurate fit for the description given in the question, as it precisely captures the dimensions specified (1" x 12" x 12").

Understanding the proper measurement terms is essential for anyone working in forestry or lumber production, as it not only affects inventory and sales but also has implications for pricing and resource management.