(sports) A catamaransailing racing yacht, with a wingsail mainsol, developed for the 2013 America's Cup world tour, the 2013 America's Cup pre-regatta tune-up league, called the America's Cup World Series.
noun
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Alternative Forms
Alternative Form of ac45 -
ac45-s
Other Word Forms
Noun
Singular:
ac45
Plural:
ac45s
Origin of ac45
Blend of America's Cup and 45, from the fact that this boat class of sailboatyacht is approximately 45-feet on the waterline