'Pneumonia' names the disease of breathing organs with a word whose deepest root means 'breath' itself.
An infection that inflames the air sacs in one or both lungs, which may fill with fluid or pus.
From Modern Latin 'pneumonia,' from Greek 'pneumonia' (lung disease), from 'pneumōn' (lung), from 'pneuma' (breath, wind, spirit), from 'pnein' (to breathe, to blow), from PIE *pneu- (to breathe). The silent 'p' in English reflects the Greek consonant cluster 'pn-,' which was pronounced in ancient Greek but became unpronounceable in English. The word 'pneuma' carried vast philosophical significance in Stoic