node
US /noʊd/
UK /noʊd/

1.
a point in a network or diagram at which lines or pathways intersect or branch.
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Each computer in the network acts as a node.
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The diagram shows the different nodes in the system.
2.
a swelling or protuberance on a plant stem or root; a joint.
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The bamboo stalk has distinct nodes.
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New leaves often emerge from a node.
3.
a point at which a standing wave has zero amplitude.
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The string vibrated with a node at its center.
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Understanding nodes and antinodes is crucial in wave physics.