ULCERED
\ˈʌlsəd], \ˈʌlsəd], \ˈʌ_l_s_ə_d]\
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Tetraneumona
- A division of Arachnida including those spiders which have four lungs, or pulmonary sacs. It includes the bird spiders (Mygale) and trapdoor spiders. See Mygale.