Human hair may vary in its physical dimensions.
(1) diameter in microns (micrometers)
(2) length in mm
< 30 µm
<= 2 mm
> 2 mm
30 to 60 µm
> 60 µm
• Lanugo comes from the Latin lana for wool. Vellus is Latin for fleece.
• There is no term listed for a hairs with a diameter >= 30 µm with a length <= 2 mm. This could be called stubble but for these the length will not be used as a criteria.
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