Having two distinct forms, shapes, or appearances; existing in or assuming two different forms.
From Latin 'bi-' (two) + 'forma' (form or shape). The term has been used since medieval times to describe things with dual natures or appearances.
Janus, the Roman god with two faces looking in opposite directions, perfectly embodies the concept of 'biform'—and we still name the month January after him, making January an eternal reminder of duality.
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