I. sitting-place:
1. seat, chair, stool, bench, Il.19.77, Od.3.7; “ἀγοραί τε καὶ ἕδραι” 8.16, cf. 3.31; seat of honour, “περὶ μέν σε τίον . . ἕδρῃ τε κρέασίν τε” Il.8.162, 12.311; “ἕδραις γεραίρειν τινά” X.Cyr.8.1.39; “τιμίαν ἕ. ἔχειν” A.Eu.855; throne, “ἐκβαλεῖν ἕδρας Κρόνον” Id.Pr.203; θακεῖν παγκρατεῖς ἕ. to sit on an almighty throne, ib.391, cf. Pers.466.
2. seat, abode, freq. in pl., Pi.O.7.76, P.11.63, etc.; esp. of the gods, sanctuary, temple, Id.I.7(6).44, A.Ag.596, etc.; also νέοικος ἕ. station for ships, Pi.O.5.8; “ναύλοχοι ἕδραι” S.Aj.460: periphr., “ἕδραισι Θεράπνας” Pi.P.11.63; “Παρνησοῦ ἕδραι” A.Eu.11, cf. E.Tr.557 (lyr.); βλεφάρων ἕ. the eye, Id.Rh. 8 (anap.); ὄμματος ἕ. ib.554 (lyr.).
3. seat or place of anything, ἐξ ἕδρας out of its right place, Id.Ba.928, cf. Plu.Fab.3; “καταναγκάσαι ἐς ἕδρην” Hp.Mochl.38; “ὁ ἥλιος ἐκλιπὼν τὴν ἕ.” Hdt.7.37; τὴν τοῦ ἥπατος ἕ., σπλάγχνου, etc., Pl.Ti.67b, 72c, etc.; ἐκ τῆς ἕ. ὠθεῖν ib.79b; ἔχειν ἕδραν to keep its place, Arist.Mete.356a4; “μεταθέσεις ἐξ ἕδρας ἀτόμων” Epicur.Fr.61; ἕδραν στρέφειν to wriggle, Thphr.Char.27.14; “στοὰν εἰς τὴν ἀρχαίαν ἕ. ἐπαναγαγεῖν” D.C.57.21; base, Plu.Demetr.21: metaph. in Rhet., D.H.Dem.31, etc.; of a plant, Gp.5.9.9.
6. seat of a physiological process, “ἕ. ἀναθρέψεως” Gal.18(2).105.
2. sitting still, Hp.Aër.20: hence, inactivity, delay, “περιημέκτεε τῇ ἕδρῃ” Hdt.9.41; “ἀχθομένων τῇ ἕ.” Th.5.7; “οὐχ ἕδρας ἀκμή” S.Aj.811; “οὐχ ἕδρας ἀγών” E.Or.1291; “οὐχ ἕδρας ἔργον” B.Fr.11; also οἰκίης ἕδρῃ sitting at home, Herod.4.92.
3. position, γονυπετεῖς ἕδραι kneeling, E.Ph.293 (lyr.); βέλεος ἕδρη place occupied by a weapon which fixes itself in the skull, Hp.VC7.
4. sitting, session of a council, etc., εὐθὺς ἐξ ἕδρας when he rose from the sitting, S.Aj.780 (but ἐξ ἕδρας ἀνίσταται ib.788, means from quietude); ἕδραν ποιεῖν to hold a sitting, And.1.111, cf.IG12.110.41.
III. seat, breech, fundament, Hdt.2.87, Hp. Aph.5.22, Ar.Th.133, etc.; of birds and animals, rump, Arist.HA 633b8, Simon Eq.9, etc.
IV. Geom., face of a regular solid, Theol.Ar.37.