Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Any of several branches of science, such as microbiology, zoology, botany, or ecology, that deal with living organisms and their organization, life processes, and relationships to each other and their environment.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun Biology and its subsets.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun any of the branches of natural science dealing with the structure and behavior of living organisms

Etymologies

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