THICK'NESS, noun The state of being thick; denseness; density; as the thickness of fog, vapor or clouds.

1. The state of being concrete or inspissated; consistence; spissitude; as the thickness of paint or mortar; the thickness of honey; the thickness of the blood.

2. The extent of a body from side to side, or from surface to surface; as the thickness of a tree; the thickness of a board; the thickness of the hand; the thickness of a layer of earth.

3. Closeness of the parts; the state of being crowded or near; as the thickness of trees in a forest; the thickness of a wood.

4. The state of being close, dense or impervious; as the thickness of shades.

5. Dullness of the sense of hearing; want of quickness or acuteness; as thickness of hearing.