[noo-muh-kok-uh s, nyoo‐]

noun, plural pneu·mo·coc·ci [noo-muh-kok-sahy, ‐see, nyoo‐] /ˌnu məˈkɒk saɪ, ‐si, ˌnyu‐/.

a bacterium, Diplococcus pneumoniae, causing lobar pneumonia and associated with certain other diseases, as pericarditis and meningitis.

Origin of pneumococcus

From New Latin, dating back to 1885–90; see origin at pneumo-, -coccus
Related formspneu·mo·coc·cal [noo-muh-kok-uh l, nyoo‐] /ˌnu məˈkɒk əl, ˌnyu‐/, pneu·mo·coc·cic [noo-muh-kok-sik, nyoo‐] /ˌnu məˈkɒk sɪk, ˌnyu‐/, pneu·mo·coc·cous [noo-muh-kok-uh s, nyoo‐] /ˌnu məˈkɒk əs, ˌnyu‐/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for pneumococcus

Historical Examples of pneumococcus

  • The bacteria were chiefly staphylococci, rarely the pneumococcus or the micrococcus catarrhalis.

    The Treatment of Hay Fever

    George Frederick Laidlaw

  • Cultivations from the heart blood gave a pure growth of a typical (capsulated) pneumococcus.

  • Another interesting feature about the pneumococcus is its vitality outside of the body.

    Preventable Diseases

    Woods Hutchinson

  • Widely present as the pneumococcus is, we know well that it is powerless for harm except in unhealthful surroundings.

    Preventable Diseases

    Woods Hutchinson

  • Recognition of the pneumococcus depends upon its morphology, the fact that it is Gram-staining, and the presence of a capsule.

British Dictionary definitions for pneumococcus


noun plural -cocci (-ˈkɒkaɪ)

a spherical bacterium that occurs in the respiratory tract, esp the Gram-positive Diplococcus pneumoniae, which causes pneumonia
Derived Formspneumococcal, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

pneumococcus in Medicine



n. pl. pneu•mo•coc•ci (-kŏksī′, -kŏkī′)

A nonmotile, gram-positive bacterium (Streptococcus pneumoniae) that is the most common cause of bacterial pneumonia and is associated with meningitis and other infectious diseases.
Related formspneu′mo•coccal (-kŏkəl) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.