Having two horns or horn-shaped parts; characterized by two projecting or curved extensions.
From Latin 'bicornis' + '-uous' (adjective suffix variant). An archaic or rare variant of 'bicornate' and related forms, found in older scientific and heraldic texts.
Medieval heraldry used 'bicornuous' to describe demon or devil symbols—two horns were the ultimate evil marker—which is why Satan got horns in Western art, a visual language that every knight and noble would instantly recognize on a coat of arms.
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