Generally referring to an organism able to withstand relative extremes in environmental conditions.
Capable of withstanding effects. For example, grass is tolerant of 2,4-D to the extent that this herbicide can be used selectively to control broadleaf weeds without killing the grass.
Capable of withstanding effects e.g. grasses are tolerant of 2,4-D to the extent that it can be used selectively to control broad-leaved weeds in cereals, pastures and turf (see tolerance).