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biodegradable subject to decomposition by the action of living organisms such as bacteria.
biodiesel a low-polluting type of diesel fuel made from renewable, organically-derived oils such as vegetable oils or waste animal fats.
biodiversity the diversity of life forms on earth or part of the earth, including diversity of species, genes, and ecosystems, esp. when regarded as providing the optimal conditions for evolution.
bioelectricity the scientific study of biological electric currents and fields and of the effects of external electromagnetic forces on biological systems.
bioengineering the application of engineering principles and technology to medical and biological problems, such as the modification of genes.
biofeedback a method for self-regulation of presumably involuntary bodily functions, such as heartbeat rate, with the aid of electronic monitors that display visual representations of such functions.
bioflavonoid any of a group of yellow hydrocarbon pigments found in many flowers and fruits, once thought to be important as a vitamin in humans; vitamin P.
biogenesis the principle that living organisms are generated only by other living organisms. [2 definitions]
biogeography the study of the geographic distribution of living organisms.
biographer a person who writes biography.
biographical of or relating to the facts and circumstances of a person's life. [2 definitions]
biography an account, usu. written, of the facts and circumstances of one person's life. [3 definitions]
biohazard a biological substance or condition that endangers human life or health.
biological of or pertaining to biology.
biological warfare the use of living organisms such as bacteria or viruses to kill or disable people or destroy their food supply.
biologist a scientist who specializes in biology.
biology the science that is concerned with the growth, development, and functioning of living things. [3 definitions]
bioluminescence the emission of light produced naturally by certain kinds of insects, fish, or bacteria, or such light itself.
biomagnetism the scientific study of the effects of magnetic forces on biological systems.
biomass the quantity of living matter in a particular habitat measured by weight of organisms per unit of habitat area or by weight or volume of organisms per unit of habitat volume.
biomedicine the branch of medicine concerned with human survival and functioning in abnormal environmental conditions.