One of the mysteries of the English language finally explained.
Medicine. Abnormal accumulation of air or gas in a part of the body, especially (more fully "pneumatosis intestinalis", "pneumatosis cystoides intestinalis") in the intestinal wall; an instance of this.
Mid 17th century (in an earlier sense). From post-classical Latin pneumatosis accumulation of air in the stomach or intestines, nervous activity from ancient Greek πνευμάτωσις evaporation, in Hellenistic Greek also accumulation of air in the stomach or intestines from πνευματοῦν to turn into vapour, to blow up, inflate + -ωσις.
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