Noun
tetromino (plural tetrominoes)
(geometry) A polyomino made up of four squares connected edge to edge.
A free tetromino is a free polyomino made from four squares. Source: Internet
Gerasimov reports that Pajitnov chose the name "Tetris" as "a combination of ' tetromino ' and 'tennis'." Source: Internet
In Blokus, each color begins with every pentomino (12), as well as every tetromino (5), every triomino (2), every domino (1), and the monomino (1). Source: Internet
Tetracubes Each of the five free tetrominoes has a corresponding tetracube, which is the tetromino extruded by one unit. Source: Internet