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

  • noun Movement of a motile organism using the earth's gravity for orientation.

from The Century Dictionary.

  • noun The orientation or locomotion of cells or of organisms in relation to the direction of the earth (or to gravity).

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

  • noun biology A living creature's ability to move by orienting itself by gravitational forces.


Sorry, no etymologies found.



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