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- gairbhe dromchla Tagairt Faomhadh an téarma seo mar chuid de Thionscadal Lex
- ga
- surface roughness
- en
- Sainmhíniú measure of finer surface irregularities in surface texture Tagairt "Engineers' Edge 2000-2009, ""Surface Roughness Review"" http://www.engineersedge.com/surface_finish.htm [27.11.2009]"
- Nóta Surface roughness Ra is the arithmetic average deviation of the surface valleys and peaks in micrometres. ISO standards use the synonymous term CLA (Centre Line Average).