Strong's G2168 — εὐχαριστέω (verb)
eucharisteo (yoo-khar-is-teh'-o) v.
1. to be grateful
2. (actively) to express gratitude (towards)
3. (specially) to say grace at a meal
[from G2170]
KJV: (give) thank(-ful, -s) 
Root(s): G2170 
Hebrew root: εὐχάριστος
Occurrences: 38