'Any of a group of chemical substances such as doxycycline or streptomycin'
an antibiotic
A-B-C: Any of a group of chemical substances such as doxycycline or streptomycin
Any of a group of chemical substances such as doxycycline or streptomycin
Any of a group of chemical substances such as doxycycline or streptomycin
A-B-C
an antibiotic
A-B-C