n. 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.
1896  Once a tidal stream, the creek had been brought into subjection by what the country people call a "bito," built across its mouth to shut out the tides. . . .
1898  "Aboideau" . . . is often corrupted to "bi-to" (like bite-o). . . .
1957  . . . the word is pronounced as if spelled Byetoe [on the Peticodiac and Shepody Rivers]. . . .