chiasma

/kaɪˈæzmə/
noun
  1. A crossing or intersection of two structures, especially in biology where nerves or chromosomes cross.
    • The doctor explained that the chiasma of the optic nerves helps us see with both eyes together.
    • The optic chiasma is where the nerves from each eye cross over in the brain.
    • During meiosis, a chiasma forms between paired chromosomes, allowing them to exchange genetic material.
  2. A rhetorical or literary device where words or phrases are repeated in reverse order (e.g., 'Fair is foul, and foul is fair').
    • The teacher pointed out the chiasma in the sentence 'She went to the store, and to the bank went he.'
    • In his speech, the politician employed a chiasma: 'Ask not what your country can do for you, but what you can do for your country.'
    • The poet used a chiasma in the line 'Love without end, and without measure grace.'
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