Real Dictionary

brick
variable noun: Bricks are rectangular blocks of baked clay used for building walls, which are usually red or brown. Brick is the material made up of these blocks.

Brick in American English
a substance made from clay molded into oblong blocks and fired in a kiln or baked in the sun, used in building, paving, etc.
built or paved with brick
urban township in E N. J.: pop. 76,000
noun: a block of clay hardened by drying in the sun or burning in a kiln, and used for building, paving, etc.: traditionally, in the U.S., a rectangle 21⁄4× 33⁄4× 8 in. (5.7 × 9.5 × 20.3 cm), red, brown, or yellow in color

brick in British English
noun: a rectangular block of clay mixed with sand and fired in a kiln or baked by the sun, used in building construction