Strong’s Greek
G2171 — euche
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
εὐχή
euche — pronounced yoo-khay'
from 2172; properly, a wish, expressed as a petition to God, or in votive obligation:--prayer, vow. see GREEK for 2172
3 occurrences in the KJV.
Acts 18:18
And Paul after this tarried there yet a good while, and then took his leave of the brethren, and sailed thence into Syria, and with him Priscilla and Aquila; having shorn his head in Cenchrea: for he had a vow.
Acts 21:23
Do therefore this that we say to thee: We have four men which have a vow on them;
James 5:15
And the prayer of faith shall save the sick, and the Lord shall raise him up; and if he have committed sins, they shall be forgiven him.