[noo-muh-kok-uhs, nyoo‐]
noun, plural pneumococci [noo-muh-kok-sahy, ‐see, nyoo‐] .
a bacterium, Diplococcus pneumoniae, causing lobar pneumonia and associated with cerain other diseases, as pericarditis and meningitis.

1885–90; < Neo-Latin; see pneumo-, -coccus

pneumococcal [noo-muh-kok-uhl, nyoo‐] , pneumococcic [noo-muh-kok-sik, nyoo‐] , pneumococcous [noo-muh-kok-uhs, nyoo‐] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pneumococcus (ˌnjuːməʊˈkɒkəs)
n , pl -cocci
a spherical bacterium that occurs in the respiratory tract, esp the Gram-positive Diplococcus pneumoniae, which causes pneumonia

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

pneumococcus pneu·mo·coc·cus (nōō'mə-kŏk'əs, nyōō'-)
n. pl. pneu·mo·coc·ci (-kŏk'sī', -kŏk'ī')
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.

pneu'mo·coc'cal (-kŏk'əl) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Bacteria on the rise may be filling the ecological void left by the decline in the vaccine's seven pneumococcus strains.
No currently available vaccine protects against all types of pneumococcus.
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