Having two distinct phases or stages that occur in a sequence or alternating pattern.
From the prefix 'bi-' (two) combined with 'phasic' (from Greek 'phasis' meaning appearance or phase). The term emerged in scientific contexts in the 19th century to describe phenomena with two clear phases.
Your heart's electrical activity is biphasic—when doctors look at an EKG, they're watching two distinct phases of electrical charge spreading through your heart, which is why the pattern looks like distinctive peaks and valleys.
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