What does "thermoneutrality" mean?

The state of being neutral with regard to heat effects; the state of being thermoneutral

Thermoneutrality

noun

noun ·Rare ·Advanced level

Noun

1
The state of being neutral with regard to heat effects; the state of being thermoneutral uncountable
"the zone of thermoneutrality"
2
The heat-neutral temperature for a given animal: the temperature at which it does not need to regulate its body temperature uncountable
"activity at thermoneutrality"

From thermo- + neutrality.