monilethrix

[mə-nĭlə-thrĭks′]
n.
  1. A condition in which the hair is brittle and shows a series of constrictions, resembling strings of spindle-shaped beads.beaded hair moniliform hair
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.