Sentence:  On the average, he found caucasoids to have the longest heads and <WSD>mongoloids</WSD> the roundest; <WSD>mongoloids</WSD> the straightest hair and negroids the most tightly curled; caucasoids the narrowest noses and negroids the broadest. 
Meaning of the word marked with <WSD> tags:  A member of the racial classification of humanity composed of peoples native to North Asia, East Asia, Pacific Oceania, and the Americas, as well as their diaspora in other parts of the world.