[ZT]node

node (nod) noun

1.A knob, knot, protuberance, or swelling.
2.a. Botany. The point on a stem where a leaf is attached or has been    attached; a joint.
3.Physics. A point or region of virtually zero amplitude in a periodic system.
4.Mathematics. The point at which a continuous curve crosses itself.
5.Computer Science. A terminal in a computer network.
6.Astronomy. a. Either of two diametrically opposite points at which the orbit of a planet intersects the ecliptic. b. Either of two points at which the orbit of a satellite intersects the orbital plane of a planet.