Definitions

from The Century Dictionary.

  • A family of Protozoa, of the order Amœboidea, containing the genera Arcella, Difflugia, etc., the members of which are inclosed in a kind of test.

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

  • proper noun A natural family of soil and freshwater protozoa; cosmopolitan.

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

  • noun soil and freshwater protozoa; cosmopolitan in distribution

Etymologies

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Examples

  • Professor Claus has looked at this latter organism, and thinks that it is the shell of a rhizopod, probably one of the Arcellidae.

    Insectivorous Plants Charles Darwin 1845

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