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Adjective: protuberant  prow't(y)oo-bu-runt [N. Amer], pru't(y)oo-bu-runt [Brit]
  1. Bulging or projecting outward
    "I thought the protuberant sail made the ship go faster";
    - bellied, bellying, bulbous, bulging, bulgy

See also: protrusive