from The Century Dictionary.

  • A division of reticulate amœbiform protozoans, whose test is many-chambered or polythalamian: opposed to Monothalamia. The name is less exactly used as a synonym of Foraminifera.

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

  • noun plural (Zoöl.) A division of Foraminifera including those having a manychambered shell.


Sorry, no etymologies found.


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  • What is more remarkable, M. Ehrenberg has ascertained that at least fifty-seven species of the microscopic animals of the chalk, being infusoria and calcareous-shelled polythalamia, are still found living in various parts of the earth.

    Vestiges of the Natural History of Creation

  • Species of sea mollusks, of reptiles, and of mammifers, have been changed again and again, since the cretaceous era; and it is not till a long subsequent age that we find the first traces of any other of even the humblest species which now exist; but here have these humble infusoria and polythalamia kept their place on earth through all its revolutions since that time, -- are we to say, safe in their very humility, which might adapt them to a greater variety of circumstances than most other animals, or are we required to look for some other explanation of the phenomenon?

    Vestiges of the Natural History of Creation


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