1. the study of living organisms, divided into many specialized fields that cover their morphology, physiology, anatomy, behavior, origin, and distribution.
▪ the plants and animals of a particular area: "the biology of Chesapeake Bay"
▪ the physiology, behavior, and other qualities of a particular organism or class of organisms:"human biology"
Word Originlate 17th century (in the sense ‘biography’): from Greek bios ‘life’ + -logy. The sense ‘the study of living organisms’ dates from the late 18th century and is based on Latin.