Quick Definition
ὀχύρωμα, ατος, τό n.n. a fortress, strong defense
Strong's Definition
from a remote derivative of 2192 (meaning to fortify, through the idea of holding safely); a castle (figuratively, argument)
KJV Usage: stronghold
UBS Dictionary of the Greek New Testament
noun, n. | -τος
7.21 · Constructions · Buildings
stronghold, fortress a strong military fortification The term ὀχύρωμα occurs in the NT only in 2CO 10:4, where it is used figuratively of the strength of false arguments. In a number of languages it may be more satisfactory to render ὀχύρωμα as a kind of simile so as to mark this figurative usage, for example, ‘powerful weapons with which to destroy false arguments in the same way that people would destroy fortresses.’ In some languages a ‘fortress’ may be described in terms of its function, for example, ‘a place for protection’ or ‘a place to defend oneself.’ Often, however, a fortress is described in terms of its construction, for example, ‘a strong-walled place.’
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
ὀχύρωμα, -ros, τό, (ὀχυρόω [to make strong, to fortify ]) ; 1. prop. a castle, stronghold, fortress, fastness, Sept. for 7¥3D, ete.; very often in 1 and 2 Mace.; Xen. Hellen. 3; 2, oe 2. trop. anything on which one relies: καθεῖλε τὸ ὀχύρωμα, ἐφ᾽ ᾧ ἐπεποίθεισαν, Prov. xxi. 22; ὀχύρωμα ὁσίου φόβος κυρίου, Prov. x. 29; in 2 Co. x. 4 of the arguments and reasonings by which a disputant endeavors to fortify his opinion and defend it against his opponent.
Mounce Concise Greek Dictionary
ὀχύρωμα ochurōma 1x
a stronghold; met. an opposing bulwark of error or vice, 2 Cor. 10:4*
Abbott-Smith Greek Lexicon
ὀχύρωμα, -τος, τό
(< ὀχυρόω, to fortify, make firm), [in LXX for מִבְצָר, etc.;]
a stronghold, fortress (Ps 88 (89):40, Na 3:12, 14 al.); in LXX and NT, also metaph. of that in which confidence is placed (Pr 10:29 21:22, al.): II Co 10:4.†
Liddell-Scott-Jones — Greek-English Lexicon
ὀχύρωμα (ochurōma) — stronghold. ὀχῠρ-ωμα, ατος, τό, stronghold, fortress, prison, [LXX+5th c.BC+]