Welsh

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Etymology

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From chwe (six) +‎ ongl (angle).

Noun

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chweongl m (plural chweonglau, not mutable)

  1. hexagon
    Synonym: hecsagon

Further reading

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