The space inclosed between ranges of hills or mountains; the strip of land at the bottom of the depressions intersecting a country, including usually the bed of a stream, with frequently broad alluvial plains on one or both sides of the stream. Also used figuratively.

The place of meeting of two slopes of a roof, which have their plates running in different directions, and form on the plan a reëntrant angle.

The depression formed by the meeting of two slopes on a flat roof.

The area createdwhere low roof slopes meet, forming an angle or channel.

A long area of low land between stretches of high land. There is normally a stream at the bottom.'v'-shaped

a course of a stream that has at least a limited extent of reasonably level ground bordered on the sides by higher ground

a stretched-out groove in the land, usually formed by streams or rivers

A relatively long, narrow land area lying between two areas of higher elevation, often containing a stream. The San Fernando Valley in California is a valley that gets very hot in the summer.

a very critical area and the design cannot be breached or it will leak

The area surrounding a friction ridge, which does not make contact with an incident surface under normal touch conditions. On the fingers, the unique patterns formed by the friction ridges and valleys make up the fingerprints.

The area surrounding a friction ridge, which does not make contact with an incident surface under normal touch; the area of the finger between two friction ridges.