An instrument used to measure angles or to set objects to a desired angle. Examples include optical instruments used in surveying or for measuring crystal angles (as between crystal faces), and radio receivers and directional antennae used to determine the angular direction of incoming radio signals.
[Greek gōniā, angle; see genu-1 in the Appendix of Indo-European roots + -METER.]
go′ni·o·metric (-nē-ə-mĕtrĭk), go′ni·o·metri·cal adj.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.