A node is a point of connection. Technically, a traffic intersection is a node since multiple roads connect at that point.

Another type of node is a round swelling. Some are abnormal, like a node you discover on your knee, but others, such as a lymph node, are a normal part of your immune system. You can also find a node on a plant: it’s the swelling on the stem marking the spot where leaves emerge. Computer techs know that a node can also be a piece of equipment — like your cable modem — in a computer network. In a sense, that kind of node is also a connecting point — like the traffic intersection.

Definitions of node
  1. noun

    any thickened enlargement

    knob, thickening
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    type of:

    convex shape, convexity

    a shape that curves or bulges outward

  2. noun

    any bulge or swelling of an anatomical structure or part

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    a small node
    type of:

    solid body substance

    the solid parts of the body

  3. noun

    (botany) the small swelling that is the part of a plant stem from which one or more leaves emerge

    leaf node
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    type of:

    enation, plant process

    a natural projection or outgrowth from a plant body or organ

  4. noun

    (physics) the point of minimum displacement in a periodic system

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    (physics) the point of maximum displacement in a periodic system
    type of:


    the precise location of something; a spatially limited location

  5. noun

    the source of lymph and lymphocytes

    lymph gland, lymph node
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    axillary node

    any of the lymph glands of the armpit; fights infections in the neck and chest and arm regions
    Peter’s gland, Peyer’s patch

    any of several lymph nodes in the walls of the intestines near the junction of the ileum and colon

    a lymph node that is inflamed and swollen because of plague or gonorrhea or tuberculosis
    type of:

    lymphatic tissue, lymphoid tissue

    tissue making up the lymphatic system

  6. noun

    (computer science) any computer that is hooked up to a computer network

  7. noun

    a connecting point at which several lines come together

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    type of:

    connection, connexion, link

    a connecting shape

  8. noun

    (astronomy) a point where an orbit crosses a plane

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    ascending node

    the point at which an orbit crosses the ecliptic plane going north
    descending node

    the point at which an orbit crosses the ecliptic plane going south
    type of:

    celestial point

    a point in the heavens (on the celestial sphere)

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