The Collaborative International Dictionary of English v.0.48:

Leiotrichi \Lei*ot"ri*chi\ (-k[imac]), n. pl. [NL., fr. Gr.
   lei^os smooth + qri`x, tricho`s, hair.] (Anthropol.)
   The division of mankind which embraces the smooth-haired
   races.
   [1913 Webster]