Definitions

3. An unpleasant or unhealthy smell or vapour
6. a chemical agent that slows or inhibits the development of microorganisms
9. to give a weak form of a disease to a person or animal, usually by injection, as a protection against that disease
10. of the Four Humours the belief that the substances that make up the human body are: black bile, yellow bile, blood, and phlegm
11. An organism that can be seen only through a microscope. Examples include bacteria, protozoa, algae, and fungi
12. heating liquid or food to kill microorganisms

1. the Romans built these to transport fresh water to highly populated areas
2. protected against, not affected by a disease
4. medicines that treat infections by killing bacteria
5. scanner a powerful Xray that provides a cross-section of the human body invented in 1972
7. a substance used to stimulate the production of antibodies and provide immunity against a disease
8. a heart monitor invented by Willem Einthoven in the early 1900’s