Defn: A tank containing pipes through which circulates steam, water, air, or the like, for heating or cooling; — used in some heating and ventilation systems.

THERMOTAXIC
Ther`mo*tax"ic, a. Etym: [Thermo- + Gr. (Physiol.)

Defn: Pertaining to, or connected with, the regulation of temperature in the animal body; as, the thermotaxic nervous system.

THERMOTAXIS Ther`mo*tax"is, n. [NL.; thermo-+ Gr. an arranging.] (Physiol.) (a) The property possessed by protoplasm of moving under the influence of heat. (b) Determination of the direction of locomotion by heat.

THERMOTENSILE
Ther`mo*ten"sile, a.

Defn: Pertaining to the variation of tensile strength with the temperature.

THERMOTENSION
Ther`mo*ten"sion, n. Etym: [Thermo- + tension.]

Defn: A process of increasing the strength of wrought iron by heating it to a determinate temperature, and giving to it, while in that state, a mechanical strain or tension in the direction in which the strength is afterward to be exerted.

THERMOTHERAPY
Ther`mo*ther"a*py, n. [Thermo-+ therapy.] (Med.)

Defn: Treatment of disease by heat, esp. by hot air.