| A | B |
|---|
| Locard Exchange Principle | The tenet that there is always a cross transfer of evidence between suspect and victim |
| morphology | Form and structure of hair |
| polymer | A molecule consisting of many identical repeating units |
| cuticle | The tough protective outer layer of hair |
| cortex | The dense tubular layer inside the hair cuticle that provides strength. It comprises most of the hair mass. |
| medulla | The spongy interior core of hair that gives it flexibility |
| keratin | a tough protein polymer made up of about 20 different amino acids |
| undulation | Slight waviness |
| micrometer | one millionth of a meter or one thousandth of a millimeter |
| anagen phase | Period of growth in the hair cycle, average 3 years |
| catagen phase | An intermediate period of hair growth, lasting about 3 weeks |
| telogen phase | Final phase in hair growth, resulting in the loss of hair over about 3 months |
| cortical fusi | Irregular shaped air spaces in the cortex of hair |
| interference patterns | A phenomenon demonstrating the wave nature of light resulting from constructinve (additive) and destructive combinations of light waves |
| melanin | A natural pigment found in hair and skin. Ultraviolet rays in sunlight increase its concentration causing tanning |
| association | A link between an unknown material to known evidence |
| questioned | A sample that has been collected from a known location, but is of unknown origin |
| exemplar | A term used in forensics to describe a sample of known origin |
| metabolite | A specific product of a substance, formed by chemical processes in the body |
| false positive | A test result which comes out positive when it should not, often caused by contamination or lack of running a control |
