in anatomy or pathology, any normal or abnormal knot, thickness, or swelling
a lymph node
in a plant, the point on a stem at which one or more leaves are attached
in astronomy, either of the points where the orbit of a celestial body or artificial satellite intersects a defined plane, e.g. ecliptic plane or the equator
in mathematics, the point where a curve intersects itself
in physics:
a point, line, etc of a vibrating body at which the vibration is at a minimum
a point where current or voltage is zero
in computing:
a point in a network where lines cross or branch
a computer terminal or peripheral attached to a network
[Latin nodus knot, node]