One of the mysteries of the English language finally explained.
1Of a surface or curve: not changed in form by inversion.
2Of a tessellation in which the cells are of one or other of two colours: such that placing any two columns, or any two rows, side by side results in half the adjacent cells having the same colour and half having different colours.
Mid 19th century. From an- + ancient Greek ἀλλαγματ-, ἄλλαγμα something given in exchange + -ic, after French anallagmatique.
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