HairFactz Definitions
Some words have more than one meaning. Only those meanings relating to this site will be used.
All Definitions
Razor Cut Hair
A razor cut hair is angular and very straight or clean.

Photo is a hair cut with a razor.
Root
The root is the structure at the proximal end of a hair. The mature hair root will be hardened, have a bulbous shape (shaped like a bulb), and have little or no follicular tissue adhering to it. Pigment is sparse or absent, and there is frequently an abundance of cortical fusi. A root that has been plucked prior to maturation will be soft, have a distorted appearance, and may have tissue adhering to it. Pigment is present, and there are rarely cortical fusi. A catagen root may exhibit the bulbous shape with a tag attached. Hairs are naturally sloughed from the body after a period of growth. The life cycle of hair includes:
- Anagen phase - when a hair root is actively grows.
- Catagen phase - when hair growth begins to shut down and stop activity. Catagen phase is a transitional root stage between the anagen (actively growing) phase and telogen (resting) phase.
- Telogen phase - the last phase of the hair growth cycle when a hair is resting and is ready to be naturally shed. After the telogen phase, the hair growth process starts over again to the anagen phase.