mantic

adjective

man·tic ˈman-tik

: of or relating to the faculty of divination : prophetic

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The adjective mantic comes from the Greek word mantikos, which itself derives from mantis, meaning "prophet." The mantis insect got its name from this same source, supposedly because its posture—with the forelimbs extended as though in prayer—reminded folks of a prophet. Not surprisingly, the combining form -mancy, which means "divination in a (specified) manner" (as in necromancy and pyromancy), is a relative of mantic. A less expected, and more distant, relative is mania, meaning "excitement manifested by mental and physical hyperactivity, disorganized behavior, and elevated mood" or "excessive or unreasonable enthusiasm." Mania descends from Greek mainesthai ("to be mad"), a word akin to mantis and its offspring. And indeed, prophesying in ancient Greece was sometimes believed to be "inspired madness."