PENETRALIUM

PRONUNCIATION: (peh-nuh-TRAY-lee-uhm)

MEANING: noun: The innermost, secret, or hidden parts of something.

ETYMOLOGY: Back-formation from penetralia (plural of penetrale), based on the mistaken assumption that its singular form was penetralium. From penetrare (to penetrate), from penitus (interior) + intrare (to enter).
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BENETRALIUM - the definitive biography of poet Steven Vincent Benet

PENETRANIUM - an icepick wound to the skull

PELE-TRALIUM - fanciful way to refer to the soccer paparazzi from 1956 to 1974 (especially Brazil)