1. A knob or protuberance.

2. A small, rounded mass of tissue, such as a lymph node.

3. A point of constriction along a nerve.

1. One of two points at which the orbit of a planet, planetoid, or comet crosses the plane of the ecliptic.

2. One of two points at which a satellite crosses the equatorial plane of its primary.

A site on a plant stem at which leaves and axillary buds arise.

See <<branch point>>

A junction point within a network.

That point along a fault at which the direction of apparent displacement changes.

On a graphic presentation of a project, a symbol placed at the intersection of arrows that represent activities to identify the completion or start of an activity.

See <<crunode>>

A point, line, or surface in a standing-wave system where some characteristic of the wave has essentially zero amplitude.