The Collaborative International Dictionary of English v.0.48:

Pneumonia \Pneu*mo"ni*a\ (n[-u]*m[=o]"n[i^]*[.a]), n. [NL., fr.
   Gr. pneymoni`a, fr. pney`mwn, pl. pney`mones the lungs, also,
   pley`mwn, which is perh. the original form. Cf. Pneumatio,
   Pulmonary.] (Med.)
   Inflammation of the lungs.
   [1913 Webster]

   Note:

   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]

WordNet (r) 3.0 (2006):

lobar pneumonia
    n 1: pneumonia affecting one or more lobes of the lung; commonly
         due to streptococcal infection