Webster's English Dictionary

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node

node \'no-d\ n [L nodus knot, node - more at NET] 1: an entangling 
   complication : PREDICAMENT  2a: a thickened or swollen enlargement (as of a 
   rheumatic joint)  2b: a discrete mass of one kind of tissue enclosed in 
   tissue of a different  kind 3: either of the two points where the orbit of 
   a planet or comet intersects  the ecliptic 4a: a point at which subsidiary 
   parts originate or center  4b: a point on a stem at which a leaf or leaves 
   are inserted  5: a point, line, or surface of a vibrating body that is free 
   or relatively  free from vibratory motion