| Term | Definition |
| antiseptic | substance that kills microorganisms |
| contamination | becoming non sterile through contact with any non sterile material |
| diseases | pathologic processes having a descriptive set of sign |
| disinfection | destruction of pathogens by physical or chemical means |
| edema | swelling between layers of tissue |
| infection | invasion of body tissues by microorganisms that then proliferate and damage tissue |
| microorganisms | live organisms that can be seen only with a light microscope |
| pathogens | disease-causing microorganisms |
| permeable | allowing a substance to pass or soak through |
| sanitization | cleaning the environment to reduce the number of pathogenic microorganisms |
| spores | thick-walled dorment forms of bacteria, very resistant to disinfectant measures |
| sterilization | complete destruction of all forms of microbial life |