mono·pha·sic \| ̷ ̷ ̷ ̷|fāzik\adjective Etymology:mon- + phasic 1.: single-phase < a monophasic electric current > 2.of an animal: having a single period of activity followed by a period of rest in each 24 hours < man may be considered a naturally monophasic being > — compare polyphasic