pineal
/ˈpɪnɪəl/(亦作pineal gland, pineal body)
noun
- a pea-sized conical mass of tissue behind the third ventricle of the brain, secreting a hormone-like substance in some mammals（脑的）松果体。
词源
late 17th cent.: from French pinéal, from Latin pinea 'pine cone'. The anatomical term refers to the shape of the gland.