Definitions

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

  • noun The study of organisms or environmental conditions that have been rendered free of bacteria or contaminants or into which a known microorganism or contaminant has been introduced for research purposes.

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

  • noun The science involved with maintaining a microbiologically controlled environment.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Greek gnōtos, known; see gnō- in Indo-European roots + biotics, study of living organisms.]

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