Meaning

noun a recreational facility including a swimming pool for water sports

originAfter Lido (Lido di Venezia), an island with a long beach in Venice, Italy, site of Europe’s first modern beach resort (1857), from Italian lido (“beach, shore”), from Latin litus (“shore”) (hence also English littoral (“of the shore”)). The name is aspirational, evoking glamorous Venice; compare Venetian Pool, another outdoor pool named for Venice.

Etymology from Wiktionary, CC BY-SA 3.0