1. The inability to distinguish between heat and cold: A newborn child is a good example of an individual who experiences thermanesthesia and cannot distinguish between hot and cold.
2. Absence or loss of heat-perception; insensibility to heat: As a result of nerve damage in her hand, Quincy had thermanesthesia and so she had to be very careful when working in the kitchen.

Loss of the normal sense of temperature, or the loss of one's ability to differentiate between what is hot or of any degree of coldness: After his severe illness, Thomas appeared to experience thermoanesthesia and couldn't tell whether something was hot or cold, such as when he washed his hands after turning on the faucet with very hot water.