A traditional unit of distance used in watchmaking. The word is French for "twelfth," and a douziéme is equal to 1/12 Swiss ligne. This is about 188 micrometers (microns) or 7.4 mils
Russ Rowlett (Director), How Many? A Dictionary of Units of Measurement, Center for Mathematics and Science Education University of North Carolina, USA 2005. http://www.unc.edu/~rowlett/units/dictA.html, (Unit of Meas and Covr Factors - Amer) {608}