cuneus

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cuneus

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Borrowed from Latin cuneus. Doublet of coign and coin.

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cuneus (plural cunei)

(neuroanatomy) A portion of the occipital lobe of the human brain, involved in visual processing.
(entomology) A wedge-shaped section of the forewing of certain heteropteran bugs.
(architecture) One of a set of wedge-shaped divisions separated by stairways, found in the Ancient Roman theatre and in mediaeval architecture.

portion of the occipital lobe

entomology: section of forewing