Probably from a primary hepo (to be busy about); an implement or utensil or tool (literally or figuratively, especially, offensive for war)


armour, instrument, weapon.

Textus Receptus Greek Text

opla
Rom 6:13, Rom 6:13, Rom 13:12, 2 Cor 10:4

oplwn
John 18:3, 2 Cor 6:7