natatorial

On a warm spring weekday afternoon, the local swimming hole beckons . . . and boys will be boys. "Mr. Foster [the town truant officer] knew very well where to find us . . . at our vernal and natatorial frolics," confessed John Gould in The Christian Science Monitor (January 10, 1992), some 70 years after that warm spring day of his youth. The Latin verb natare, meaning "to swim," gave English the word natatorial and its variant "natatory." It also gave us "natant" ("swimming or floating in water"); "supernatant" ("floating on the surface"); "natation" ("the action or art of swimming"); and last but not least, "natatorium" ("an indoor swimming pool").