Definitions

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

  • noun An arrangement of images reduced in size, as on microfilm or microfiche.

from The Century Dictionary.

  • noun A microscopic organism, or one that is too small to be studied without a microscope.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Biol.) A microscopic form of life; an animal or vegetable organism of microscopic size.

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

  • noun microfilm, microfiche or similar materials
  • noun biology A microscopic form of life; an animal or vegetable organism of microscopic size.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

micro- +‎ form

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