from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Plural form of planarium.

from the GNU version of the Collaborative International Dictionary of English

  • n. Any species of turbellarian worms belonging to Planaria, and many allied genera. The body is usually flat, thin, and smooth. Some species, in warm countries, are terrestrial.

from The Century Dictionary and Cyclopedia

  • n. The typical genus of Planariidæ. P. torva is an example.

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

  • n. free-swimming mostly freshwater flatworms; popular in laboratory studies for the ability to regenerate lost parts


Sorry, no etymologies found.


  • This experiment involved one of the most primitive forms of life, a type of worm called planaria.

    Meditation as Medicine

  • Although animals such as planaria and starfish can regrow virtually any part of their bodies, humans have restricted regenerative capabilities.

    Media Newswire

  • July 28th, 2009 3: 39 pm ET yeah, fascinating like planaria ... but I wouldn't put one of those in office either ...

    Powell calls Palin a 'fascinating figure'

  • Within a year, the presence of RNAi had been documented in many other organisms, including fruit flies, trypanosomes, plants, planaria, hydra and zebrafish27.

    Advanced Information: The 2006 Nobel Prize in Physiology or Medicine

  • Charles Darwin used Werner's Nomenclature of Colors but the only mention of "broccoli-brown" in Voyage of the Beagle is in a description of some kind of planaria.

    Archive 2008-05-01

  • Scientists kept a group of planaria in a dark box, flashed a light at them, then shocked them with electricity.

    Meditation as Medicine

  • Jim, this research—if I'm understanding Ael correctly—had its earliest antecedents on Earth in some very primitive mind experiments concerning planaria.

    My Enemy My Ally

  • [169] Dr. Cobbold has informed the Author that he has never observed a planaria divide spontaneously, and he is sceptical as to that process taking place at all.

    On the Genesis of Species

  • If the head of _planaria lugubris_ is cut off just behind the eyes, there develops at the cut surface of the head-piece another head turned in the opposite direction.

    At the Deathbed of Darwinism A Series of Papers

  • Cut them in two or more pieces, each piece will grow into a perfect planaria again.

    Country Walks of a Naturalist with His Children


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