a. [ Thermo- + Gr. &unr_; arrangement. ] (Physiol.) Pertaining to, or connected with, the regulation of temperature in the animal body; as, the thermotaxic nervous system. [ 1913 Webster ]

n. [ NL.; thermo- + Gr. &unr_; 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. [ Webster 1913 Suppl. ]