Correct spelling, explanation: the form Antarctic is connected with the word Antarctica, which is a Greek word antarktikos meaning opposite to the Arctic. When it comes to the spelling of the word Antarctic, it is worth mentioning that we start it with a capital letter and there is a -c letter in the middle of the word, which is often forgotten by many users of English.

Definition of Antarctic:
noun – it comes with the, so it is the Antarctic and it relates to a cold area which is located around the South Pole,
The Antarctic is still a region of great exploration for scientists.
adjective – relates or belongs to the Antarctic or Antarctica,
He took part in a difficult Antarctic expedition.

Expressions with Antarctic:
The word is a part of common geographical names, such as Antarctic Ocean, Antarctic Zone, or Antarctic Circle.

Incorrect spelling, explanation: a common mistake made by both native users of English and its learners is to omit the letter -c in the middle of the word Antarctic, which gives an incorrect form Antartic. The mistake probably comes from the pronunciation, which doesn’t suggest that there is a -c in the middle of the word.