- The fine hair present on the body before puberty.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Examples from the Web for vellus
Historical Examples of vellus
From the Italian word velluto, signifying velvet, which comes from vellus, hair or fleece.