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Answer for the clue "Puzzle piece made up of five squares ", 9 letters:
pentomino

Word definitions for pentomino in dictionaries

Wikipedia Word definitions in Wikipedia
A pentomino is a plane geometric figure formed by joining five equal squares edge to edge. It is a polyomino with five cells. There are twelve pentominoes, not counting rotations and reflections as distinct. They are used chiefly in recreational mathematics ...

Wiktionary Word definitions in Wiktionary
n. (context geometry English) A polyomino made up of five squares.

Usage examples of pentomino.

She looked down at the complex mess of her R Pentomino and blew out her cheeks.