flexagon
present participle of upfurl
plural of witchen-tree
(West Midlands) Barmy; mad; daft.
(geometry) A flat model made from folded strips of paper that can be folded, or flexed, to reveal a number of hidden faces.
数学クラブの集まりで、ライナは色鮮やかな折りたたみ式の紙模型を実演し、その隠れた面の幾何学的な仕組みを説明した。
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