materia medica /mə-tēˈri-ə medˈi-kə/

1. Substances used in medicine
2. The science of their properties and use

• head-centre
• headchair
• headchairs
• headcheese
• headcheeses
• headcloth
• headcloths
• head cold
• head colds
• head count
• head counts
• head-crash
• head-crashes
• head-down display
• headdress
• headdresses
• headed
• header
• headers
• header tank
• headfast
• headfasts
• head first
• head foremost
• headframe