An underwater swimmer equipped with a face mask and foot fins and either a snorkel or an air cylinder(noun)
WordNet. Princeton University. 2010.
Use "skin-diver" in a sentence
"January 18, 2008 at 4:57 pm a orca in a red skin-diver soot?"
"The beetle crawled downward through it, like a skin-diver who has already passed the safety-knot on his line, but is too drugged by the ecstasy of the depths to care."
"My dad had this Sea Hunt TV series in the 60s where he developed such a strong persona that people actually thought he was a skin-diver."