One of the mysteries of the English language finally explained.
1Each of the twelve distinct planar shapes that can be formed by joining five identical squares by their edges.
2In plural A board game or puzzle involving the rearrangement of plastic or wooden pentomino shapes.
1950s; earliest use found in American Mathematical Monthly. From penta- + -omino; coined by S. W. Golomb by analogy, taking the d- of domino (by an intentional false etymology) to represent either di- or duo-.
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