Sentence:  "..."customs which the <WSD>Antarcticans</WSD> might have. How he wished he had made the trip alone, and need not share with Adam the scientific triumphs to come! / Of course she was—the daughter of Morrison, Hull's companion who had befriended and protected him against the <WSD>Antarcticans</WSD>. 
Meaning of the word marked with <WSD> tags:  A native of Antarctica.