Of or pertaining to logarithms. Also in logarithmic sine, tangent, secant, etc., used (somewhat incorrectly) to denote the logarithm of the…

a test of the clotting ability of blood, used e.g. in the monitoring of patients receiving oral anticoagulants; (also) the time taken for blood to…

= logarithmic phase at logarithmic, adj. a.

The simultaneous synthesis and degradation of a substance in a living organism; turnover rate, turnover time (see quot. 1943).

the time for which a biological system survives after a given dose of a chemical or ionizing radiation.

Chiefly Biology and Chemistry. A quantity (or increased quantity) of a reactant, isotopic label, drug, or other substance supplied to a system…

Chiefly Biology. A period of darkness, esp. one that is artificially imposed; an artificial night.