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Arctic

Capitalize as geographic feature. Strictly speaking, Arctic refers to the region north of the Arctic Circle, though the term "Arctic region" can be used to include nearby areas of the subarctic.

Lowercase plants and animals found in Webster's:
  Arctic Circle
the Arctic
Arctic Ocean
high Arctic
Arctic region
Arctic zone
Arctic boots
Arctic life
Arctic coast
Arctic scientist
eastern Arctic town
Arctic night
arctic char, tern, bear, fox,
hare, wolf
Russian Arctic people
Arctic people
high Arctic islands
subarctic (noun and adjective)