FROM STRONG’S GREEK DICTIONARY (1890)

Strong’s Greek Dictionary (1890) — public domain, printed whole.

ischuo ἰσχύω — is-khoo'-o — from 2479; to have (or exercise) force (literally or figuratively):--be able, avail, can do(-not), could, be good, might, prevail, be of strength, be whole, + much work.

see GREEK for 2479