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Webster's 1913 Dictionary

TETRAPNEUMONA

Tet `ra *pneu "mo *na, n. pl. Etym: [NL. See Tetra-, and Pneumo-. ](Zoöl.)

 

Defn: 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.