from The Century Dictionary.

  • noun [lowercase] In pathology, absence of hair; alopecia or atrichosis.
  • noun The typical and only genus of the family Atrichiidæ. A. clamosa is the scrub-bird of Australia. J. Gould, 1844. Also called Atrichornis.
  • noun A genus of dipterous insects.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The absence of hair due to congenital or acquired physical reasons.


Sorry, no etymologies found.


  • Ten years ago researchers found that mutations in the HR gene are responsible for congenital atrichia, where hair is shed completely during the first year of life and never regrows.


  • Dr Zhang, whose findings are published online in Nature Genetics, has now shown a sequence immediately adjacent to HR encodes the chemical, and that mutations affecting its function are found in families with MUHH (Maria Unna hereditary hypotrichosis), a condition related to congenital atrichia.



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