bacitracin
noun
bac·i·tra·cin ˌba-sə-ˈtrā-sᵊn 
: a polypeptide antibiotic isolated from a bacillus (Bacillus subtilis or B. licheniformis) and usually used topically especially against gram-positive bacteria
Example Sentences
Recent Examples on the Web Apply a thin layer of an antiseptic ointment, such as bacitracin, under the dressing. 
Paul Auerbach, Outside Online, 9 Apr. 2012 The bills in our database show that one hospital in Tennessee charged a patient a pretty reasonable $1 for bacitracin — while another hospital in Seattle charged $76 for the exact same ointment. Sarah Kliff, Vox, 18 Dec. 2018
Paul Auerbach, Outside Online, 9 Apr. 2012 The bills in our database show that one hospital in Tennessee charged a patient a pretty reasonable $1 for bacitracin — while another hospital in Seattle charged $76 for the exact same ointment. Sarah Kliff, Vox, 18 Dec. 2018 Word History
Etymology
New Latin Bacillus subtilis (species of bacillus producing the toxin) + Margaret Tracy born about 1936 American child in whose tissues it was found
First Known Use
1945, in the meaning defined above
Medical Definition
bacitracin
noun
bac·i·tra·cin ˌbas-ə-ˈtrās-ᵊn
: a polypeptide antibiotic isolated from a bacillus (Bacillus subtilis or B. licheniformis) and usually used topically especially against gram-positive bacteria