Definitions

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

  • noun A chemical or physical marker indicating the presence of life, especially something sought in geologic formations or in an extraterrestrial environment.

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

  • noun biology Any measurable phenomenon that indicates the presence of life

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From bio- +‎ signature.

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