pneumonia(n = noun.state) - respiratory disease characterized by inflammation of the lung parenchyma (excluding the bronchi) with congestion caused by viruses or bacteria or irritants;
is a kind of respiratory disease, respiratory disorder, respiratory illness
has particulars: bronchial pneumonia, bronchopneumonia, lobar pneumonia, pneumococcal pneumonia, interstitial plasma cell pneumonia, pneumocystis carinii pneumonia, pneumocystis pneumonia, pneumocytosis, pleuropneumonia, viral pneumonia
Derived form adjective pneumonic₁

   Inflammation of the lungs. [1913 Webster]
" Catarrhal pneumonia, or Broncho-pneumonia, is inflammation of the lung tissue, associated with catarrh and with marked evidences of inflammation of bronchial membranes, often chronic; -- also called lobular pneumonia, from its affecting single lobules at a time. -- Croupous pneumonia, or ordinary pneumonia, is an acute affection characterized by sudden onset with a chill, high fever, rapid course, and sudden decline; -- also called lobar pneumonia, from its affecting a whole lobe of the lung at once. See under Croupous. -- Fibroid pneumonia is an inflammation of the interstitial connective tissue lying between the lobules of the lungs, and is very slow in its course, producing shrinking and atrophy of the lungs." [1913 Webster]

pneumonia, n. a bacterial inflammation of one lung (single pneumonia) or both lungs (double pneumonia) causing the air sacs to fill with pus and become solid.

Derivative:
pneumonic adj.

Etymology:
L f. Gk f. pneumon lung

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anthrax pneumonia, aspiration pneumonia, atypical pneumonia, bronchial pneumonia, brooder pneumonia, double pneumonia, interstitial plasma cell pneumonia, interstitial pneumonia, lobar pneumonia, mycoplasmal pneumonia, plague pneumonia, pneumococcal pneumonia, pneumocystis carinii pneumonia, pneumocystis pneumonia, primary atypical pneumonia, shipping pneumonia, viral pneumonia, woolsorter's pneumonia