One of the mysteries of the English language finally explained.
Any planar shape formed by joining a number of identical right-angled isosceles triangles along edges of the same length.
1960s; earliest use found in Scientific American. From poly- + -abolo, by analogy, taking the d- of diabolo (by an intentional false etymology) to represent either di- or duo-: see quot. 1967, and compare polyiamond and (for a similar analogy) earlier pentomino.
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