rheo-, rhea-, rhe-, rhy-

(Greek: a flow, wave; current of a stream, current; electrical current)

rheoreceptor, rheoreceptive
A sensory receptor that is sensitive to the flow of the surrounding water; sensitive to water or air currents.
1. An instrument for detecting the presence or movement of currents of electricity.
2. A tool by which the existence of an electric current may be determined; an electroscope.
rheostat (s) (noun), rheostats (pl)
A variable resistor used to adjust the current in an electrical circuit: Susan's ceiling lamp above her dining table used a rheostat, or dimmer switch, to regulate the brightness of the light produced, from very dim to very bright!
The photographic record of the curve of variations in experiments upon the electromotive action of muscles.
rheotaxis, rheotactic
The orientation of an organism in a stream of liquid or air current, with its long axis parallel with the direction of fluid flow.

Negative rheotaxis refers to the movement of the organism in the same direction as that of the liquid (current); positive rheotaxis refers to the movement of the organism in the opposite direction to that of the liquid or current.

A device for interrupting an electric current.
rheotrope (s) (noun), rheotropes (pl)
An instrument for reversing an electric current.
Pertaining to organisms that obtain nutrients largely from percolating or running water.
rheotropism, rheotropic
An orientation response to a water or air current; a movement contrary to the motion of a current, involving part of an organism, rather than the organism as a whole, as in rheotaxis.