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Noun, pl. nodes (Medicine) 1. A hard concretion or incrustation which forms upon bones attacked with rheumatism, gout, or syphilis; sometimes also, a swelling in the neighborhood of a joint. (wiktionary.org) 2. A pathological swelling or enlargement (as of a rheumatic joint). (merriam-webster.com) 3. A discrete mass of one kind of tissue enclosed in tissue of a different kind. (merriam-webster.com) (Astronomy) 1. The point where the orbit of a planet, as viewed from the Sun, intersects the ecliptic. The ascending and descending nodes refer respectively to the points where the planet moves from S to N and N to S. The respective symbols are ☊ and ☋. (wiktionary.org) 2. 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. (merriam-webster.com) (Physics) 1. A point, line, or surface of a vibrating body or system that is free or relatively free from vibratory motion. (merriam-webster.com) 2. A point at which a wave has an amplitude of zero. (merriam-webster.com) 3. The point of minimum displacement in a periodic system. (wordnetweb.princeton.edu) (Botany) 1. A stem node. (wiktionary.org) 2. A point on a stem at which a leaf or leaves are inserted. (merriam-webster.com) 3. A point at which a curve intersects itself in such a manner that the...