θῠρεός,ὁ, (θύρα)
A. stone put against a doorto keep it shut, Od. 9.240 , 313 .
II. oblong shield (shaped like a door), PSI 4.428.36
(iii B.C.), Inscr. ap. Plu. Pyrrh. 26 , Callix. 2 ; hence, of the Romanscutum(opp.ἀσπίς,=clipeus), Plb. 2.30.3 , 6.23.2 , D.H. 4.16 , cf. Ep.Eph. 6.16 , Apollod. Poliorc. 163.2 , Arr. Tact. 3.2 , etc.
III. diskforming part ofκαθετήρ, IG 11(2).287
B 68 (Delos,iii B.C.).
IV. Math.,oval, Procl. in Euc. 1
Deff. 3 , 8 .