'Thermoregulator' definitions:

Definition of 'thermoregulator'

noun

A regulator for automatically regulating temperature by starting or stopping the supply of heat [syn: thermostat, thermoregulator]

From: GCIDE

Thermoregulator \Ther`mo*reg"u*la`tor\, n. (Physics) A device for the automatic regulation of temperature; a thermostat. [Webster 1913 Suppl.]