A platform or level ground surface on which heavy guns are mounted.
[French terreplein, from Italian terrapieno, from terrapienare, to fill with earth : terra, earth (from Latin; see ters- in the Appendix of Indo-European roots) + pieno, full (from Latin plēnus; see pelə-1 in the Appendix of Indo-European roots).]
(click for a larger image)terreplein
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. 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.