Early Quenya
ondole
noun. stone monument; stone-cairn
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
ondole
noun. stone monument; stone-cairn
A word appearing as ᴱQ. ondole “a stone monument” in the Qenya Lexicon of the 1910s as an elaboration of ᴱQ. ondo “stone” (QL/70). In the Poetic and Mythological Words of Eldarissa it was glossed “stone-cairn” (PME/70).
Neo-Quenya: Since ondo “stone” survived in Tolkien’s later writings, I would retain ᴺQ. ondolë for a monument or cairn made of stone (either refined or rough).