triomino

• (Received Pronunciation) IPA^(key): /tɹaɪˈɒmɪnəʊ/
• (General American) enPR: trī-ŏmʹĭ-nō', IPA^(key): /tɹaɪˈɑmɪˌnoʊ/

• Audio (US):

  (file)

• Rhymes: -ɒmɪnəʊ, -ɒmənəʊ

From tri- +‎ (d)omino.

triomino (plural triominoes or triominos)

1. (games) A triangular tile, used in triominoes, a variant of the game of dominoes.

   Note: as the game plays, polyiamonds are created.

• Triominoes on Wikipedia.Wikipedia

From tri- +‎ (poly)omino.

triomino (plural triominoes or triominos)

1. (geometry) Alternative form of tromino

   A polyomino made up of three squares connected edge to edge.