an instrument consisting of a spirit level mounted under and parallel to a telescope, the latter being rigidly attached to its supports.
Origin of dumpy level
First recorded in 1830–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
surveying a levelling instrument consisting of a horizontal telescope with various rotational arrangements and a spirit level
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012