hair follicle

noun

: the tubular epithelial sheath that surrounds the lower part of the hair shaft and encloses at the bottom a vascular papilla supplying the growing basal part of the hair with nourishment see hair illustration

Examples of hair follicle in a Sentence

Recent Examples on the Web
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Two subsequent screens — a urine test and a hair follicle analysis — returned negative results, Heitmann said. Louis Casiano, FOXNews.com, 24 Apr. 2026 Nektar Therapeutics said Monday that extended treatment with its experimental drug, called rezpeg, promoted greater hair growth in people with severe alopecia areata, an autoimmune condition that attacks hair follicles. Adam Feuerstein, STAT, 20 Apr. 2026 One thing that can and does happen commonly after a hair transplant is shock loss, a condition where nearby hair follicles cycle through and transition to a rest phase due to stress in the surrounding tissue associated with a hair transplant. Michelle Lee, PEOPLE, 18 Apr. 2026 In Turkey, transplants are often performed not by doctors, but by technicians, who charge about $3,000 and use a variety of methods to move hair follicles from one part of the head to another. Cindy Krischer Goodman, Sun Sentinel, 9 Apr. 2026 See All Example Sentences for hair follicle

Word History

First Known Use

1838, in the meaning defined above

Time Traveler
The first known use of hair follicle was in 1838

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Cite this Entry

“Hair follicle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hair%20follicle. Accessed 3 May. 2026.

Kids Definition

hair follicle

noun
: the tube-shaped sheath surrounding the lower part of a hair shaft

Medical Definition

hair follicle

noun
: the tubular epithelial sheath that surrounds the lower part of the hair shaft and encloses at the bottom a vascular papilla supplying the growing basal part of the hair with nourishment

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