noun, plural streptococci [strep-tuh-kok-sahy, -see] . Bacteriology.
any of several spherical or oval bacteria of the genus Streptococcus, occurring in pairs or chains, certain species of which are pathogenic for humans, causing scarlet fever, tonsillitis, etc.

1875–80; < Neo-Latin; see strepto-, coccus

streptococcal [strep-tuh-kok-uhl] , streptococcic [strep-tuh-kok-sik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
streptococcus (ˌstrɛptəʊˈkɒkəs)
n , pl -cocci
Often shortened to: strep any Gram-positive spherical bacterium of the genus Streptococcus, typically occurring in chains and including many pathogenic species, such as S. pyogenes, which causes scarlet fever, sore throat, etc: family Lactobacillaceae

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

bacteria genus, 1877, Mod.L., coined by Viennese surgeon Albert Theodor Billroth (1829-94) from Gk. streptos "twisted" + Mod.L. coccus "spherical bacterium," from Gk. kokkos "berry." So called because the bacteria usually form chains.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

streptococcus strep·to·coc·cus (strěp'tə-kŏk'əs)
n. pl. strep·to·coc·ci (-kŏk'sī, -kŏk'ī)
A bacterium of the genus Streptococcus.

strep'to·coc'cal or strep'to·coc'cic adj.

Streptococcus n.
A genus of gram-positive, anaerobic, often pathogenic bacteria having an ovoid or spherical appearance and occurring in pairs or chains, including many erythrocytolytic and pathogenic species that cause erysipelas, scarlet fever, and septic sore throat in humans.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
streptococcus   (strěp'tə-kŏk'əs)  Pronunciation Key 
Plural streptococci (strěp'tə-kŏk'sī, -kŏk'ī)
Any of various bacteria of the genus Streptococcus that are gram-positive cocci and are normally found on the skin and mucous membranes and in the digestive tract of mammals. One type of streptococcus, Group A, is a common pathogen in humans and causes various infections, including strep throat, scarlet fever, pneumonia, and some types of impetigo.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
streptococcus [(strep-tuh-kok-uhs)]

A category of bacteria that can cause various infections in humans, including scarlet fever and strep throat.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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