‖Tet′ra‐neu″mo‐na (?), n. pl. [NL. See Tetra-, and Pneumo-.] (Zoöl.) 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.