Also called double tide.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.
an earthen mound or rampart, especially one having no revetment.
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This grand agger can be traced almost in its entire extent, as also the smaller aggers.
Nothing can be more plainly traced—a proper agger or vallum, with its corresponding ditch or fossa.
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.