Geo'desy, the science of measuring or surveying extensive portions of the earth's surface by triangulation (see ORDNANCE SURVEY). The objects of the survey are generally to determine the contour and dimensions of the earth, and in a secondary degree to acquire materials and measurements for accurate maps.
Geo'desy
Chambers's Encyclopaedia, Volume 5: Friday to Humanitarians, p. 138
Source scan(s): p. 0147