coccus

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coccus

 [kok´us] (pl. coc´ci) (L.)
a spherical bacterium, usually slightly less than 1 μ in diameter, belonging to the Micrococcaceae family. It is one of the three basic forms of bacteria, the other two being bacillus (rod-shaped) and spirillum (spiral-shaped). A pathogenic coccus can almost always be classified as either a staphylococcus (occurring in clusters), or a streptococcus (occurring in short or long chains). Both staphylococci and streptococci are gram-positive and do not form spores.

The staphylococci are responsible for many serious infections, especially Staphylococcus aureus, which is the causative agent in boils, abscesses, osteomyelitis, and a large variety of other infections. Staphylococci have received much attention in recent years because of the ability of most strains to develop a resistance to antibiotics.

The most dangerous streptococci are those of the beta-hemolytic type. Various species of streptococci cause sore throat, scarlet fever, mastoiditis, and septicemia.
Cocci.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

coc·cus

, pl.

coc·ci

(kok'ŭs, kok'sī), Avoid mispronouncing the plural form kok'ī.
1. A bacterium of round, spheroid, or ovoid form.
2. Synonym(s): cochineal
[G. kokkos, berry]
Farlex Partner Medical Dictionary © Farlex 2012

coccus

(kŏk′əs)
n. pl. cocci (kŏk′sī, kŏk′ī)
A bacterium having a spherical or spheroidal shape.

coc′cal (kŏk′əl) adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

coc·cus

, pl. cocci (kokŭs, -sī)
1. A bacterium of round, spheroid, or ovoid form.
2. Synonym(s): cochineal.
[G. kokkos, berry]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

coccus

A common type of spherical or spheroidal bacterium. Cocci connected in line are called STREPTOCOCCI; those in bunches are called STAPHYLOCOCCI.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

coccus

a bacterium having a spherical or globular form.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

coc·cus

, pl. cocci (kokŭs, -sī)
A bacterium of round, spheroid, or ovoid form.
[G. kokkos, berry]
Medical Dictionary for the Dental Professions © Farlex 2012