资料来源 : Webster's Revised Unabridged Dictionary (1913)

Letts \Letts\ (l[e^]ts), n. pl.; sing. {Lett} (l[e^]t).
   (Ethnol.)
   An Indo-European people, allied to the Lithuanians and Old
   Prussians, and inhabiting a part of the Baltic provinces of
   Russia.