Etymology
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pineal (adj.)

1680s, in reference to the gland in the brain, from French pinéal, literally "like a pine cone," from Latin pinea "pine cone," from pinus "pine tree" (see pine (n.)).

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Definitions of pineal

pineal (adj.)
relating to the pineal body;
pineal hormone
pineal (adj.)
having the form of a pine cone;
From wordnet.princeton.edu