1) Diplococcus 2) Diplococcus pneumoniae 
• (n.) A form of micrococcus found in the sputum (and elsewhere) of persons suffering with pneumonia, and thought to be the cause of this disease.
(Streptococcus pneumoniae), spheroidal bacterium in the family Streptococcaceae that causes human diseases such as pneumonia, sinusitis, otitis ... [14 related articles]
<bacteria> A genus of bacteria that is typified by gram-positive staining and a coccal shape (round) that are usually observed microscopically in pairs. A common cause of pneumonia. ... (27 Sep 1997) ... 
(noo″mo-kok´әs) a member of the species Streptococcus pneumoniae. adj., pneumococ´cal., adj.
Pneu`mo·coc'cus noun [ See Pneumo- , and Coccus .] (Biol.) A form of micrococcus found in the sputum (and elsewhere) of persons suffering with pneumonia, and thought to be the cause of this disease. 
Type: Term Pronunciation: nū′mō-kok′ŭs, -kok′sī Synonyms: Streptococcus pneumoniae
[n] - bacterium causing pneumonia in mice and humans
pneumococcus (singular)
Diplococcus pneumoniae noun bacterium causing pneumonia in mice and humans