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coccus Line breaks: coc¦cus
Pronunciation: /ˈkɒkəs/

Definition of coccus in English:

noun (plural cocci ˈkɒk(s)ʌɪˈkɒk(s)iː)

Any spherical or roughly spherical bacterium.
Example sentences
  • Major and limb-threatening infections may involve aerobic gram positive cocci, gram negative bacilli, anaerobes, and enterococci.
  • Pathologic examination of the specimen revealed an organizing abscess with numerous bacterial cocci.
  • The elongation phase of growth distinguishes bacilli from cocci, which grow and divide by pure septation.


Example sentences
  • Scanning electron microscopy revealed coccal microorganisms surrounded by mucopolysaccharides consistent with a biofiolm.
  • This suggests that the coccal bacteria are capable of secreting both cellulase for dissolving the cellulose of the margo-fibrils and pectinase for dissolving the pectin-rich tori.
Example sentences
  • The waters contain an abundant, but low diversity, microbial population of thermophilic filamentous and coccoid bacteria.
  • Examination of the sinters by scanning electron microscopy confirms that they are laminated and contain an abundant, low-diversity assemblage of filamentous, bacilliform, and coccoid microbes.


Mid 18th century (denoting a scale insect): modern Latin, from Greek kokkos 'berry'. Compare with cochineal.

Definition of coccus in:
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