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n. The tendency of plants or other organisms to bend toward or away from heat.

n. Thermotropic movement of a plant or plant part in response to changes in temperature.

n. The phenomenon of turning towards a source of warmth, seen in the growing parts of some plants.

n. In biology, the bending or growing of organisms in relation to heat.

n. In botany, the phenomenon of curvature produced in a growing plant-organ by changes of temperature. Organs which curve toward the source of heat are called positively thermotropic, and those which curve away from the source of heat, negatively thermotropic.

n. an orienting response to warmth

"Thus it was that the interpretations of J. Loeb (Die Tropismen, 1913) on the basis of experiments done with lower animals, estab - lished the neologist ideas of “phototropism” (orien - tation or displacement reaction in the direction of light), and of “thermotropism” (reaction directed to - wards a source of heat), to explain animal and perhaps also human behavior."

tropism