Definition of "pineal"

pineal

/ˈpɪnɪəl/

adjective
comparative more pineal, superlative most pineal
1. In the shape of a pine cone.
2. Pertaining to the pineal gland.
noun
plural pineals
1. The pineal gland.
  Quotations
  Because of its central location and its solitary nature — most structures in the brain come in pairs, but the pineal stands alone — the philosopher René Descartes concluded that the pineal is where the soul resides.
  2019, Bill Bryson, The Body: A Guide for Occupants, Black Swan (2020), page 310