Rheotaxis

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rheotaxis

[¦rē·ə¦tak·səs]
(biology)
Movement of a motile cell or organism in response to the direction of water currents.

Rheotaxis

 

the property of certain lower plants (myxomycetous plasmodia), unicellular animals (flagellates, infusorians), and cells (spermatozoa) to move in a direction opposite to the current of a fluid.