Usage: 4 forms in 6 verses
Form Translated As     In Verse(s)
έδρασ έδρασ their buttocks LXX.1Sam.5.9
έδρασ buttocks LXX.1Sam.5.12LXX.1Sam.6.5
their buttock LXX.1Sam.5.6
έδραισ buttocks LXX.Deut.28.27
έδραι buttocks LXX.1Sam.6.17

Liddell-Scott-Jones

ἕδρα (hedra) buttock G:N-F

ἕδρα-α,

Epic dialect and Ionic dialect ἕδραη, : (ἕδος):

__I sitting-place:
__I.1 seat, chair, stool, bench, [ἕδρααι 8.16, compare 3.31 ">Refs 8th c.BC+]; seat of honour, περὶ μέν σε τίον.. ἕδρα τε κρέασίν τε [ἕδρααις γεραίρειν τινά 5th-6th c.BC: Xenophon Historicus “Institutio Cyri (Cyropaedia)” 8.1.39; τιμίαν ἕ. ἔχειν 4th-5th c.BC: Aeschylus Tragicus “Eumenides” 855 ">Refs 8th c.BC+]; throne, ἐκβαλεῖν ἕδραας Κρόνον [Refs]; θακεῖν παγκρατεῖς . to sit on an almighty throne,[Refs]
__I.2 seat, abode, frequently in plural, [Refs 5th c.BC+]; especially of the gods, sanctuary, temple, [Refs 4th c.BC+]; also νέοικος . station for ships, [ἕδρααι 5th c.BC: Sophocles Tragicus “Ajax” 460: periphrastic, ἕδρααισι Θεράπνας 5th c.BC: Pindarus Lyricus “P.” 11.63; Παρνησοῦ ἕδρααι 4th-5th c.BC: Aeschylus Tragicus “Eumenides” 11, compare 5th c.BC: Euripides Tragicus “Troades” 557 (Lyric poetry)">Refs 5th c.BC+]; βλεφάρων . the eye, [Refs]
__I.3 seat or place of anything, ἐξ ἕδραας out of its right place, [ἕδραην 5th c.BC: Hippocrates Medicus “Mochl.” 38; ὁ ἥλιος ἐκλιπὼν τὴν ἕ. 5th c.BC: Herodotus Historicus 7.37 ">Refs 5th c.BC+]; τὴν τοῦ ἥπατος ., σπλάγχνου, etc., [Refs 5th c.BC+]; ἔχειν ἕδρααν to keep its place, [ἕδραας ἀτόμων 4th-3rd c.BC: Epicurus Philosophus “Fragmenta” 61 ">Refs 4th c.BC+]; ἕδρααν στρέφειν to wriggle, [Refs 4th c.BC+]; base, [Refs 1st c.BC+]; of a plant, [Refs]
__I.4 . τοῦ ἵππου the back of the horse, on which the rider sits, [Refs 5th c.BC+]
__I.5 in plural, quarters of the sky in which omens appear, [Refs 5th c.BC+]
__I.6 seat of a physiological process, . ἀναθρέψεως [Refs 2nd c.AD+]
__II sitting, especially of suppliants, ἕδρααν ἔχειν προστρόπαιον [Refs 5th c.BC+]
__II.2 sitting still, [Refs 5th c.BC+]“Aër.” 20: hence, inactivity, delay, περιημέκτεε τῇ ἕδρα [ἕδραας ἀκμή 5th c.BC: Sophocles Tragicus “Ajax” 811; οὐχ ἕδραας ἀγών 5th c.BC: Euripides Tragicus “Orestes” 1291; οὐχ ἕδραας ἔργον 5th c.BC: Bacchylides Lyricus “fragment” 11 ">Refs 5th c.BC+]; also οἰκίης ἕδρα sitting at home, [Refs 3rd c.BC+]
__II.3 position, γονυπετεῖς ἕδρααι kneeling, [Refs 5th c.BC+]; βέλεος ἕδραη place occupied by a weapon which fixes itself in the skull, [Refs 5th c.BC+]
__II.4 sitting, session of a council, etc., εὐθὺς ἐξ ἕδραας when he rose from the sitting, [ἕδραας ἀνίσταται [prev. work] 788 ">Refs 5th c.BC+], means from quietude); ἕδρααν ποιεῖν to hold a sitting, [Refs 5th c.BC+]
__III seat, breech, fundament, [Refs 5th c.BC+]; of birds and animals, rump, [Refs 4th c.BC+]
__IV Geometry texts, face of a regular solid, [Refs]