A noun for an “heirloom” appearing in notes from around 1959-60, where the second element is mîr “jewel, precious thing” (PE17/165). Lokyt suggested the first element might be connected to √AT(AR) “father”.
Sindarin
advir
noun. 'heirloom'
advir
noun. heirloom
n. 'heirloom'. Q. atamir. >> mîr