Dictionary.com
definitions

tellurometer

[tel-yuh-rom-i-ter]
noun
  1. a surveying instrument using microwaves to measure distance.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for tellurometer

tellurometer

noun
  1. surveying an electronic instrument for measuring distances of up to about 30 miles that consists of two units, one at each end of the distance to be measured, between which radio waves are transmitted

Word Origin for tellurometer

C20: from Latin tellūs the earth + -meter
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