boater

/ˈboʊtər/
noun
  1. A person who operates or rides in a boat for pleasure or sport.
    • My uncle is an avid boater and spends every summer on his fishing boat.
    • The marina was full of boaters preparing their sailboats for the weekend race.
    • Experienced boaters know to check the weather before heading out on the lake.
  2. A stiff straw hat with a flat top and brim, traditionally worn in summer.
    • He wore a classic boater and a striped blazer to the garden party.
    • The old photograph showed her grandfather in a boater and a crisp white suit.
    • Boaters were popular in the early 1900s and are still worn at some formal summer events.
Synonyms
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