This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. a gymnast who performs on the trapeze

"She was like the kind lady who, happening to linger at the circus while the rest of the spectators pour grossly through the exits, falls in with the overworked little trapezist girl -- the acrobatic support presumably of embarrassed and exacting parents -- and gives her, as an obscure and meritorious artist, assurance of benevolent interest."

trapeze artist