thermotaxis

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Movement of a living organism in response to changes in temperature.
2. n. Normal regulation or adjustment of body temperature.

Century Dictionary and Cyclopedia

1. n. In biology, the movement of organisms in relation to heat: movement toward a higher temperature is positive thermotaxis and that toward a lower temperature negative thermotaxis.
2. n. The regulation of the bodily temperature, or the adjustment of thermogenesis and thermolysis so as to secure a certain temperature.

Wiktionary

1. n. biology Movement in response to temperature

GNU Webster's 1913

1. n. The property possessed by protoplasm of moving under the influence of heat.
2. n. Determination of the direction of locomotion by heat.