Tetrapneumona

Tet`rap`neu´mo`na


n. pl.1.(Zool.) 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, published 1913 by G. & C. Merriam Co.
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