Also called dou·ble tide [duhb-uhl tahyd] /ˈdʌb əl ˈtaɪd/ .Oceanography.
a high tide in which the water rises to a certain level, recedes, then rises again.
a low tide in which the water recedes to a certain level, rises slightly, then recedes again.
(in ancient Roman building) an earthen mound or rampart, especially one having no revetment.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use agger in a sentence
This grand agger can be traced almost in its entire extent, as also the smaller aggers.Rambles in Rome | S. Russell Forbes
Nothing can be more plainly traced—a proper agger or vallum, with its corresponding ditch or fossa.The Antiquary, Complete | Sir Walter Scott
Back to back with the equites extraordinarii are the infantry of the same, facing the agger at the rear of the whole camp.
In this case the shape of the camp becomes an oblong, the area double, and the length of the entire agger half as much again.
But the Romans had two words, agger the embankment, and vallum the palisading on the top of it.
British Dictionary definitions for agger
an earthwork or mound forming a rampart, esp in a Roman military camp
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