Definition of node
1a : a pathological swelling or enlargement (as of a rheumatic joint)
b : a discrete mass of one kind of tissue enclosed in tissue of a different kind
2 : an entangling complication (as in a drama) : predicament
3 : either of the two points where the orbit of a planet or comet intersects the ecliptic also : either of the points at which the orbit of an earth satellite crosses the plane of the equator
4a : a point, line, or surface of a vibrating body or system that is free or relatively free from vibratory motion
b : a point at which a wave has an amplitude of zero
5a : a point at which subsidiary parts originate or center
b : a point on a stem at which a leaf or leaves are inserted
c : a point at which a curve intersects itself in such a manner that the branches have different tangents
d : vertex sense 2b
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