aggers

Noun

agger (plural aggers)

1. A double tide, particularly a high tide in which the water rises to a given level, recedes, and then rises again (or only the second of these high waters), but sometimes equally a low tide in which the water recedes to a given level, rises, and then recedes again
   • The phænomenon of long continued high water or double high water in estuaries is, we believe, not uncommon. [...] The first high water appears to be considered by the Dutch, in common language, as the real high water, and the second is called the agger, but so little difference is there between...1845, George Biddell Airy, Tides and Waves, page 375
2. (historical) Synonym of earthwork in ancient Roman contexts, particularly a defensive wall or mound.
   • By the Augustan period, however, the old ashlar circuit with its earthen agger was beginning to be dismantled in some places.2012, Seth G. Bernard, “Continuing the Deabte on Rome's Earliest Circuit Walls”, in Papers of the British School at Rome, number 80, page 2

   Synonyms:

   earthwork in ancient Roman contexts, particularly a defensive wall or mound

See all 3 meanings of agger