The word “baptize” comes from the Greek word baptizo. It is just a common, ordinary, household word in the Greek language, which has been in use through the centuries. In Greek literature there are some typical examples of the use of the ordinary Greek word baptizo.
Aristotle, who lived 384-322 B.C. wrote, "The Phoenicians sailing beyond Hercules Pillars came to a land uninhabited, whose coast was full of seaweeds and is not laid under water at ebb, but when the tide comes in, it is wholly baptizo." The understanding is “covered.”
Here is a sentence from Heroclides, who lived about 325 B.C. He wrote the Homeric Allegories. He said, "Neptune is ingeniously supposed to deliver Mars from Vulcan to signify that when a piece of iron is taken red-hot out of fire, and baptizo into water, the heat is repelled and extinguished."