A noun in The Etymologies of the 1930s glossed “great hall”, an elaboration of tham “hall” under the root ᴹ√STAB (Ety/STAB).

Conceptual Development: There was a similar word G. thambros “hall” in the Gnomish Lexicon of the 1910s, an elaboration of G. tham “chamber, room” (GL/72).

Neo-Sindarin: See S. sam “chamber” for a discussion of possible later forms of this word’s root, and possible Neo-Sindarin uses.