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

  • n. A geographic region or area defined by its characteristic life forms.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. any large portion of the Earth's land area which has a generally uniform climate and soil and therefore a high degree of uniformity in the composition of species; a number of different classifications have been proposed by different people


Sorry, no etymologies found.


  • Forward of the nuclear shuttle, the life zone plus the unpressurized compartment beyond A Deck holding the unmanned probes and the MEM, the Mars Excursion Module, made up the remaining hundred and ten feet of the spacecraft.

    The Far Call


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