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n. Greek & Roman Mythology
A three-headed dog guarding the entrance to Hades.

Cer′ber·e′an (sûr′bə-rē′ən) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Before the Gates there sat On either side a formidable shape; The one seem'd Woman to the waste, and fair, But ended foul in many a scaly fould Voluminous and vast, a Serpent arm'd With mortal sting: about her middle round A cry of Hell Hounds never ceasing bark'd With wide CERBEREAN mouths full loud, and rung A hideous Peal: yet, when they list, would creep, If aught disturb'd thir noyse, into her woomb, And kennel there, yet there still bark'd and howl'd Within unseen.
Coleridge's "Night-mare Life-in-Death" (193), with her "free" looks, gaudy "red" lips, flaxen locks, and leprous, perhaps even syphilitic, skin (190-92), evokes Milton's portrayal of promiscuous Sin who, with her "fair" feminine countenance that fronts a "foul," "Cerberean" womb, offers her sexual wares to her enamored sire Satan, his damned angelic crew, and her offspring Death (PL 2.650-66, 746-67).
Secrecy, sleight-of-hand, and obfuscation - the three-headed Cerberean dog of the nuclear power industry - have guarded the portals to its inner workings since the beginning.