Thayer's Greek Lexicon
STRONGS NT 907: βαπτίζω
I.
1. properly, to dip repeatedly, to immerge, submerge (of vessels sunk, Polybius 1, 51, 6; 8, 8, 4; of animals, Diodorus 1, 36).
2. to cleanse by dipping or submerging, to wash, to make clean with water; in the middle and the 1 aorist passive...