1. Semisynthetic penicillin (trade names Principen and Polycillin and SK-Ampicillin)
   - ampicillin, Polycillin, SK-Ampicillin

Type of: penicillin

• arability
• arabinose
• Arabis
• Arabis Canadensis
• Arabis glabra
• Arabis turrita
• Arabist
• arable
• Araceae
• araceous
• Arachis
• Arachis hypogaea
• arachnid
• Arachnida
• arachnidian
• arachniography
• arachnoid
• arachnoid membrane
• arachnology
• arachnophobia
• Arafat
• Arafura Sea
• Aragon
• aragonite
• Araguaia