[mass noun] An antibiotic with a wide range of activity, used in many medicinal preparations.
- ‘These interesting properties have made gramicidin an appropriate model for studying solvent effects on the structural changes of peptides and proteins.’
- ‘In fact, gramicidin is one of the first known antibiotics.’
- ‘Her general practitioner had treated it unsuccessfully with neomycin and gramicidin ointment and oral flucloxacillin and metronidazole.’
We take a look at several popular, though confusing, punctuation marks.