One of the mysteries of the English language finally explained.
Having the shape of a pine cone; especially in "piniform decussation"noun the superior pyramidal decussation, a roughly conical area of the anterior medulla oblongata between the olivary nuclei.
Late 19th century; earliest use found in John S. Billings (1838–1913). From classical Latin pīnus pine + -iform, perhaps after scientific Latin piniformis.
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