Tet`ra*neu"mo*na\, n. pl. [NL. See Tetra-, and Pneumo-.] (Zo["o]l.) A division of Arachnida including those spiders which have four lungs, or pulmonary sacs. It includes the bird spiders (Mygale) and the trapdoor spiders. See Mygale.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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