Biphasic

Biphasic, meaning having two phases, may refer to:


 * Phase (matter), in the physical sciences, a biphasic system, e.g. one involving liquid water and steam
 * Biphasic sleep, a nap or siesta in addition to the usual sleep episode at night
 * Phase (pharmacology)
 * Biphasic disease
 * Biphasic formulations of oral contraceptive pills