Etymology
From Middle English
agger "heap", "pile", from
agger "rubble", "mound", "rampart", from
ad- +
gerere, to carry, to bring
Noun
- A high tide in which the water rises to a given level, recedes, and then rises again.
- A low tide in which the water recedes to a given level, rises, and then recedes again.
- In ancient Roman building, an earthwork; a mound; a raised work.