erythromycin: an antibiotic (trade name Erythrocin or E-Mycin or Ethril or Ilosone or Pediamycin) obtained from the actinomycete Streptomyces erythreus; effective against many Gram-positive bacteria and some Gram-negative
matter: that which has mass and occupies space
shuttle: public transport that consists of a bus or train or airplane that plies back and forth between two points