The lowest horizontal member of a framed partition or of a window or door frame.

1. A timber laid across the foot of a trench or a heading under the side truss.

2. The horizontal overflow line of a dam spillway or other weir structure.

3. A horizontal member on which a lift gate rests when closed.

4. A low concrete or masonry dam in a small stream to retard bottom erosion.

A type of robot articulation that has three degrees of freedom.

1. Submarine ridge in relatively shallow water that separates a partly closed basin from another basin or from an adjacent sea.

2. A tabular igneous intrusion that is oriented parallel to the planar structure of surrounding rock.

1. A piece of wood laid across a drift to constitute a frame to support uprights of timber sets and to carry the track of the tramway.

2. The floor of a gallery or passage in a mine.