node

noun

• 1a point at which lines or pathways intersect or branch; a central or connecting point.
• Computing a piece of equipment, such as a PC or peripheral, attached to a network.
• Mathematics a point at which a curve intersects itself.
• Astronomy either of the two points at which a planet’s orbit intersects the plane of the ecliptic or the celestial equator.
• (in generative grammar) a vertex or endpoint in a tree diagram.

• 2 Botany the part of a plant stem from which one or more leaves emerge, often forming a slight swelling or knob.

• 3 Anatomy a lymph node or other structure consisting of a small mass of differentiated tissue.

• 4 Physics & Mathematics a point at which the amplitude of vibration in a standing wave system is zero.
• a point at which a harmonic function has the value zero, especially a point of zero electron density in an orbital.
• a point of zero current or voltage.