Bioaccumulation:

Net result of uptake, transformation and elimination of a substance in an organism due to all routes of exposure (i.e. air, water, sediment/soil and food). [Source: GHS]

Bioavailability:

Rate and extent to which an agent can be absorbed by an organism and is available for metabolism or interaction with biologically significant receptors. Bioavailability involves both release from a medium (if present) and absorption by an organism. [Source: IPCS]

Bioconcentration:

Net result of uptake, transformation and elimination of a substance in an organism due to waterborne exposure. [Source: GHS]

Bioconcentration factor (BCF):

Measure of the tendency for a substance in water to accumulate in organisms, especially fish. [Source: IUPAC]

Biodegradation:

Breakdown of a substance catalyzed by enzymes in vitro or in vivo. [Source: IUPAC]

Biological control agent:

Natural enemy, antagonist or competitor, or other organism, used for pest control [Source: IPPC]

Biomagnification:

Sequence of processes in an ecosystem by which higher concentrations are attained in organisms at higher trophic levels (at higher levels in the food web). [Source: IUPAC]