The absorbing and anchoring organ of a vascular plant; it bears neither leaves nor flowers and is usually subterranean.

The portion of a dam which penetrates into the ground where the dam joins the hillside.

The origin or most fundamental point of a tree diagram. Also known as base.

The bottom of a screw thread.

1. The lower limit of an ore body. Also known as bottom.

2. The part of a fold nappe that was originally linked to its root zone.

1. A root of a given real or complex number is a number which when raised to some exponent equals that number. Also known as radix.

2. A root of a polynomial p(x ) is a number a such that p(a ) = 0.

3. A root of an equation is a number or quantity that satisfies that equation.

See <<root of weld>>