DCHP-1 Online
marsh dike 
a dike (def. 1) or dam equipped with a gate which functions as a valve releasing flood water from behind but preventing sea water from entering at high tide.
See also: aboiteau (def. 1) dike (def. 1)
- 1822 (1960) . . . a great storm in the Bay . . . broke through a weak portion of his marsh dyke which . . . he had neglected to mend.
- 1822 (1960) . . . a great storm in the Bay . . . broke through a weak portion of his marsh dyke which . . . he had neglected to mend.