What is "triomino"

alt. 1 (context games English) A triangular tile, used in triominoes, a variant of the game of dominoes. 2 (context geometry English) (alternative spelling of tromino English) n. 1 (context games English) A triangular tile, used in triominoes, a variant of the game of dominoes. 2 (context geometry English) (alternative spelling of tromino English)