Relating to the conarium, an anatomical structure (the pineal gland); concerning or of the nature of a cone-shaped bodily structure.
From conarium (Latin for pineal gland, literally 'cone-shaped') plus the suffix -ial meaning 'relating to.' The root refers to the cone-like appearance of the pineal gland.
The pineal gland was called the 'seat of the soul' by René Descartes because it looked like a tiny cone buried deep in the brain—we now know it produces melatonin, but it's still mysterious!
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