a crossing or junction of two structures, especially the point where the optic nerves cross in the brain (optic chiasm).
From Greek chiasma, from chiazein ('to mark with an X'), because the crossing point resembles the Greek letter chi (X).
Your optic chiasm is where information from your left eye crosses to the right side of your brain and vice versa—it's like your brain's own internal road crossing that lets you see 3D!
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