A biological pathogen or toxin designed or used for warfare.

The use or emphasis of biological principles or methods in explaining human, especially social, behavior.

(biology) Any of several mechanisms that regulate the periodicity of biological functions. / The progression from puberty to menopause during which a woman can bear children.

plural of biologic

A scientist working in the field of evolutionary biology.

plural of biologist

plural of biological clock

(psychology) The application of the principles of biology to the study of mental processes and behavior.

plural of biological weapon

Someone who studies marine biology.