vir·gin·ia·my·cin 
(vər-jĭn′yə-mīsĭn)
(vər-jĭn′yə-mīsĭn)n.
Any of several antibacterial substances derived from an actinomycete related to Streptomyces virginiae, used chiefly as an additive in animal feed.
[New Latin virginiae, specific epithet (from genitive sing. of Virginia, Virginia) + -MYCIN.]