chiasm

/ˈkaɪæzəm/
noun
  1. A crossing or intersection of two structures, especially nerves or fibers, in the body.
    • In the brain, the chiasm allows visual information to be processed on both sides.
    • Doctors studied the chiasm to understand how nerve signals travel to the brain.
    • The optic chiasm is where the optic nerves from each eye cross over.
  2. A rhetorical or literary device in which words or phrases are repeated in reverse order for effect (e.g., 'She went to the store, and to the store went she').
    • Learning to identify a chiasm can help you appreciate the structure of a sentence.
    • In his speech, the chiasm 'Ask not what your country can do for you, but what you can do for your country' became famous.
    • The poet used a chiasm to emphasize the balance between love and loss.
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