The quality or state of being furry; the condition of having fur or a fur-like covering.
From 'furry' with the abstract noun suffix '-ness,' creating a noun meaning the quality or degree of being furry. This is the standard way English forms abstract nouns from adjectives.
A cat's furriness can actually be measured by scientists studying animal thermoregulation—fluffier cats in cold climates is evolution in action. The word seems simple but it's actually measuring an important biological adaptation.
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