biological

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biological

(archaic), biologic
1. of or relating to biology
2. (of a detergent) containing enzymes said to be capable of removing stains of organic origin from items to be washed
3. a drug, such as a vaccine, that is derived from a living organism
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

biological

[¦bī·ə¦läj·ə·kəl]
(biology)
Of or pertaining to life or living organisms.
(immunology)
A biological product used to induce immunity to various infectious diseases or noxious substances of biological origin.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Since designs for biological filters should prevent the excessive light for the bacteria, the tank was painted blue in color in order to provide complete darkness for diurnal cycling of light regimes for nitrifying bacteria.
Biological filters were still used in the loop, but with the rapid water turnover and low biomass of cuttlefish in the system (generally varying from 80-140 kg), the water quality was always excellent.
Previous remedies have included expensive biological filters and in some instances additional specialist ultra violet filters, to the bizarre bales of barley straw.
Three commercially available biological filters were evaluated, based on a production system of tilapia culture.
Most koi fanciers favor biological filters that use bacteria or water plants to remove impurities from the water.