definitions

4. an unpleasant or unhealthy smell or vapour.
7. a substance that stops or slows down the growth of microorganisms
9. an organism that can be seen only through a microscope. Examples include bacteria, protozoa, algae, and fungi.
10. to give a weak form of a disease to a person or animal, usually by injection, as a protection against that disease
11. the Romans built these to transport fresh water to highly populated areas.
12. humours the belief that the substances that make up the human body are: black bile, yellow bile, blood, and phlegm.

1. heating liquid or food to kill microorganisms
2. a heart monitor invented by Willem Einthoven in the early 1900’s
3. protected against, not affected by a disease
5. medicines that treat infections by killing bacteria.
6. scanner a powerful Xray that provides a cross-section of the human body invented in 1972
8. a substance used to stimulate the production of antibodies and provide immunity against a disease