Tracheata

Proper noun

 * 1)  A grouping of arachnids, myriapods and insects, proposed by Ernst Haeckel in 1866, and redefined to exclude arachnids by Pocock in 1893.
 * 1)  A grouping of arachnids, myriapods and insects, proposed by Ernst Haeckel in 1866, and redefined to exclude arachnids by Pocock in 1893.