Plural of node; points where lines or connections meet, such as in networks, or knot-like swellings on plants or in the body.
From Latin 'nodus' meaning 'knot.' The word traveled through Middle English and has been used since the 1600s in mathematics, astronomy, and botany to describe junction points or knotty protrusions.
Your body is full of nodes—lymph nodes work like security checkpoints in your immune system, filtering out bad stuff before it spreads, which is why doctors check them when you're sick!
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