tumulus

Etymology

From Latin tumulus (“mound, hill”), from tumeō (“I swell”). Doublet of tombolo.

noun

1. (archaeology) A mound of earth, especially one placed over a prehistoric tomb; a barrow.
   The delicate white body will be covered to-day, The tumulus be reared, the green sod give way: And there, oh Cynvarch, thy son they will lay. 1898, Ernest Rhys, “The Lament for Urien from the Herbest”, in Welsh Ballads
   The tumulus is one of mankind's oldest burial monuments, dating back to 4,000 to 5,000 years B.C. […] Examples of tumuli can be seen peppering the landscape all over Western Europe. 2004, Douglas Keister, Stories in Stone, Gibbs Smith, →OCLC, page 14