Noun
monomino (plural monominoes)
(geometry) The polyomino made up of one square.
But it uses polyomino from 1-block monomino to 5-block pentomino that fit at most 5x5 box. 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
Like the game Pentominoes, the goal is to use all of your tiles, and a bonus is given if the monomino is played on the very last move. Source: Internet