θεσμοθετεῖον

τό
A. hall in which the θεσμοθέται met, Arist. Ath. 3.5, Plu. 2.613b (‐θέτιον Suid.s.v. Πρυτανεῖον):—also θεσμοθέσιον, τό, Plu. 2.714c, Sch.Pl. Prt. 337d, Suid.s.v. ἄρχων.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project