If a domino had four squares on its surface, it would be a tetromino. With five squares, it would be a pentomino—nine, a nonomino, eleven, an unwieldy undecomino!
Source: wiktionary
Pentomino
//pɛnˈtɒmɪnəʊ//
Synonyms for "pentomino" (2 found)
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.