noun. flattened boss on the end of nail opposite to the point.
noun. something resembling the head of a nail that is used as an ornamental device.
1. Noun, singular or mass Drop a plumb line toward the left rear nail and move it along the line until the tip of the plumb bob dissects the center of the nailhead. 2. Adjective Flip the board over to the back side and check to see if the shank of your nailhead trim is poking through.