bi|ol|o|gy «by OL uh jee», noun.
1. the science of living things; study of plant and animal life. Specialists in biology study the origin, structure, functioning, activities, and distribution of plant and animal life. Botany, zoology, and ecology are branches of biology. Abbr: biol.
2. the plant and animal life of a particular area or region.
3. the biological facts about a plant or animal.
[< bio- + -logy]

Useful english dictionary. 2012.