from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Movement of a motile organism using the earth's gravity for orientation.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A living creature's ability to move by orienting itself by gravitational forces.
from The Century Dictionary and Cyclopedia
- n. The orientation or locomotion of cells or of organisms in relation to the direction of the earth (or to gravity).
Sorry, no etymologies found.
Sexual isolation caused by selection for positive and negative phototaxis and geotaxis in Drosophila pseudoobscura.
Flies are exercised by a mechanized platform, known as the Power Tower, that rapidly, repeatedly, induces their innate instinct for negative geotaxis.