Tetrapneumona
Pronunciation : Tet`ra*pneu"mo*na
Part of Speech : n.
Etymology : [NL. See Tetra-, and Pneumo-.] (Zo?l.)
Definition : 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.
pl.
Source : Webster's Unabridged Dictionary, 1913