tromino
(ˈtrɒmɪnəʊ)
[f. tri- + domino by deliberately false analogy (see quot. 1961).]
Any planar shape formed by joining three identical squares by their edges.
| 1954 S. W. Golomb in Amer. Math. Monthly LXI. 676 It is impossible to cover the checker board with 21 straight trominoes, and a monomino in the upper left-hand corner of the board. 1961 [see pentomino]. 1979 Sci. Amer. Apr. 19/1 The games played with the two 3-cell animals (the trominoes) are slightly more difficult to analyze. |