bayonet hair

bay·o·net hair

a spindle-shaped developmental defect occurring at the tapered end of the hair.
A developmental defect of the hairshaft with excess keratinization of the upper third, which is common in ichthyosis and seborrhea and may be seen in normal scalps

bay·o·net hair

(bā-ŏ-net' hār)
A spindle-shaped developmental defect occurring at the tapered end of a hair.
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