merses

Noun

merse (plural merses)

1. Alluvial, often marshy land by the side of a river, estuary or sea.
   • Owing probably to the channel lying obliquely to those mud flats, the flood rushes up the river with a bore, the front wave of which may be several feet high. As a result, the loose mud is churned up by every tide and the water that inundates the merse always contains much mud in suspension....1926, The Journal of Ecology, volumes 14-15, page 312