'Tetrapneumona' definitions:
Definition of 'Tetrapneumona'
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Tetrapneumona \Tet`rap*neu"mo*na\, n. pl. [NL. See Tetra-, and
Pneumo-.] (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.
[1913 Webster]
