In general usage, an essential part of a thing surrounded by other essential things.: The heart or inner part of a physical thing.
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Example
Reindeer are well suited to the taiga’s frigid winters. They can maintain a thermogradient between body core and the environment of up to 100 degrees, in part because of insulation provided by their fur, and in part because of counter-current vascular heat exchange systems in their legs and nasal passages.
Order number
2
Part of speech
noun
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