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Webster 1913 Edition

Noun.

[Perh. from AS.

burg

burh

, hill +

-ock

A small weir or dam in a river to direct the stream to gaps where fish traps are placed.

Knight.

Noun.

A small wier or dam where wheels are laid in a river, for catching fish.

burrock ‎(plural burrocks)

A small weir or dam in a river to direct the stream to gaps where fish traps are placed.
(Can we find and add a quotation of Knight to this entry?)