Strong’s Greek
G4492 — rhizoo
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ῥιζόομαι
rhizoo — pronounced hrid-zo'-o
from 4491; to root (figuratively, become stable):--root. see GREEK for 4491
2 occurrences in the KJV.
Ephesians 3:17
That Christ may dwell in your hearts by faith; that ye, being rooted and grounded in love,
Colossians 2:7
Rooted and built up in him, and stablished in the faith, as ye have been taught, abounding therein with thanksgiving.