geotaxis(redirected from geotactical)
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taxis in response to gravity; movement influenced by gravity.
A form of positive barotaxis in which there is a tendency to growth or movement toward or into the earth.
[geo- + G. taxis, orderly arrangement]
Movement of a motile organism using the earth's gravity for orientation.
ge′o·tac′tic (-tĭk) adj.
geotaxisa type of animal movement (not growth) in which the body becomes orientated in relation to the force of gravity. For example, fruit flies exhibit negative geotaxis, moving upwards in the culture bottle, away from the gravitational force.