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From Middle Welsh athro (teacher), from Proto-Brythonic *alltrọw, from Proto-Celtic *altrawū (foster-uncle), from *aleti (to nourish). Related to Breton aotrou m (lord, gentleman). Doublet of alltraw (godfather).



athro m (plural athrawon or athrawion, feminine athrawes)

  1. teacher
  2. professor

Usage notes[edit]

When used to mean "teacher", this term refers only to males, the coordinate female term being athrawes. The plural athrawon serves when talking of a group of both genders. When used to mean "professor", athro it is written with the definite article and upper case A ("Yr Athro"), has no specific gender reference and used for a female or a male.

Derived terms[edit]


Welsh mutation
radical soft nasal h-prothesis
athro unchanged unchanged hathro
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.


  • R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “athro”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies