- scuba⇄adj. having to do with, comprising, or using underwater breathing equipment.
Ex. scuba diving, scuba gear, a scuba diver. - scuba⇄noun the portable breathing equipment, including one or more tanks of compressed air, used by underwater swimmers and divers.
Ex. Skindivers who use scuba favor contact [lenses] because spectacles ... are cumbersome inside a watertight face mask ( - scuba⇄scuba, noun, adjective.