pertaining to biology.
of or pertaining to the products and operations of applied biology: a biological test.
Pharmacology. any substance, as a serum or vaccine, derived from animal products or other biological sources and used to treat or prevent disease.
Also, biologic.

1855–60; biolog(y) + -ical

biologically, adverb
nonbiological, adjective
nonbiologically, adverb
pseudobiological, adjective
pseudobiologically, adverb
semibiologic, adjective
semibiological, adjective
semibiologically, adverb
unbiological, adjective
unbiologically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
biological or biologic (ˌbaɪəˈlɒdʒɪkəl)
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.  (usually plural) a drug, such as a vaccine, that is derived from a living organism
biologic or biologic
bio'logically or biologic

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1859, from biology + -ical. Biological clock attested from 1955; not especially of human reproductive urges until c.1991.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

biological bi·o·log·i·cal (bī'ə-lŏj'ĭ-kəl)

  1. Of, relating to, caused by, or affecting life or living organisms.

  2. Having to do with biology.

  3. Related by blood, as in a child's biological parents.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The answer to it cannot be a straightforward technical or biological one because food is basic to life.
But what is emerging from this research is a cluster of biological markers that
  plant the bad seed in the brain.
Yet the three populations have evolved different biological adaptations for
  surviving in oxygen-thin air, a new report says.
The biological urge is too strong to resist for penguin chicks as they fledge
  and dive into the water for the first time.
Image for biological
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