Uinendili was the name that was given to the Númenórean Guild of Venturers.

Aldarion (Tar-Aldarion) made this guild of only the strongest men in Númenor. He hoped one day to sail to Middle-Earth again and again with his new crew.

Uinendili meant 'Lovers of Uinen', who was the spouse of Ossë and the Lady of the Seas, whom Aldarion had much respect for.
Encyclopedia entry originally written by ~Venora~