Of or relating to Cerberus; having a fierce, unyielding, or monstrous quality like the mythological dog.
From Greek Kerberos (Cerberus) plus the suffix -ic, which forms adjectives. This is a variant form of cerberean, following the common pattern of multiple adjectival forms from the same root.
Languages love to create multiple adjective forms from the same noun—we do this all the time in English (like 'Christ' becomes both 'Christian' and 'Christly')—so cerberic and cerberean are essentially two different ways the ancient world adapted Cerberus's name.
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