A person who opposes or criticizes the use of balloons, or someone who actively works against balloon activities.
From anti- (against) + balloon + -er (one who does). Balloon entered English from Dutch balon in the 17th century. This is a rare, specialized term likely used in niche communities with strong opinions about ballooning.
This word is hilariously specific—imagine being so opposed to hot air balloons that you become known as an 'antiballooner'! It's the kind of word that probably exists more as a theoretical possibility than in actual common usage.
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