Sentence:  Tashtego's long, lean, sable hair, his high cheek bones, and black rounding eyes— ... all this sufficiently proclaimed him an inheritor of the unvitiated blood of those proud warrior hunters, who, in quest of the great New England moose, had scoured, bow in hand, the <WSD>aboriginal</WSD> forests of the main. 
Meaning of the word marked with <WSD> tags:  First according to historical or scientific records; original; indigenous; primitive. (First attested in the mid 17th century.)<ref name=SOED>(page=6)</ref>