Connections between nerve cells where signals pass from one neuron to another.
From Greek 'synapsis' meaning junction or fastening together, from 'syn-' (together) + 'haptein' (to clasp); coined in scientific English in the 1890s.
Your brain has about 100 trillion synapses firing millions of times per second—they're not just connections but the literal physical basis of every thought, memory, and emotion you've ever had.
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