Share this entry
polymyxin Line breaks: poly|myxin
Pronunciation: /ˌpɒlɪˈmɪksɪn/

Definition of polymyxin in English:


Any of a group of polypeptide antibiotics that are active chiefly against Gram-negative bacteria.
  • Polymyxins are obtained from soil bacteria of the genus Bacillus, in particular B. polymyxa
Example sentences
  • If the area of affected skin is limited, mupirocin is an effective topical therapy; it was more effective than the other topical antibiotics studied (i.e., neomycin, bacitracin, polymyxin B, and gentamicin).
  • Results of randomized studies assessing the efficacy of triple antibiotic ointment (e.g., polymyxin, bacitracin and neomycin) are indeterminate.
  • The vaccine contains lyophilized calf lymph and traces of polymyxin B, streptomycin, tetracycline, and neomycin.


1940s: from modern Latin polymyxa, from Greek polu- 'much' + muxa 'slime' + -in1.

Definition of polymyxin in:
Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Subscribe to remove ads and access premium resources