Biphasic

Part of speech: adjective

Definitions

1. Having or occurring in two distinct phases, stages or periods ; characterized by a pattern that alternates between two separate states
2. Marked by two separate phases of activity or development ; happening in two stages within a single cycle or process
3. Showing two distinct phases, such as a sleep pattern split into two parts ; involving a pair of stages that follow one another in sequence

Etymology: "Biphasic" is a plain technical coinage built from two pieces: the Latin prefix "bi-", meaning "two", and "phasic", the adjective from "phase." The source tree traces "phase" back to the Greek "phásis," meaning an appearance or a coming into view, and this sense of something becoming visible carried into the scientific use of "phase" for a stage in a cycle or a state of an object as seen from a particular angle. "Phasic" follows the usual pattern of adjectives ending in "-ic," itself passing through Latin "-icus" and Old French "-ique" before reaching English. Adding "bi-" to it produced a word for anything with two phases or stages, as opposed to one. In practice, "biphasic" is most often used in medicine and pharmacology, where a response, a sleep pattern, or a drug's effect can occur in two distinct stages or peaks rather than one. The word is a modern compound made from classical parts, so it was built deliberately to name a pattern that earlier single-phase terms could not describe.

Synonyms: diphasic, two-phase

Antonyms: monophasic