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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. ( 2. A pathological swelling or enlargement (as of a rheumatic joint). ( 3. A discrete mass of one kind of tissue enclosed in tissue of a different kind. ( (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 ☋. ( 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. ( (Physics) 1. A point, line, or surface of a vibrating body or system that is free or relatively free from vibratory motion. ( 2. A point at which a wave has an amplitude of zero. ( 3. The point of minimum displacement in a periodic system. ( (Botany) 1. A stem node. ( 2. A point on a stem at which a leaf or leaves are inserted. ( 3. A point at which a curve intersects itself in such a manner that the...

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Noun 1. (Geology), a small rock or mineral cluster. ( 2. (Medicine), a small aggregation of cells. ( 3. A rounded mass or irregular shape; a little knot or lump. ( 4. (Minerology) A small rounded lump of mineral substance (usually harder than the surrounding rock or sediment). ( 5. A small lump, swelling or collection of tissue. ( Word origin: From Latin nodulus “small knot,” diminutive of nodus...

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