= mill-dam, n.

(apparently) a type of fish weir.

A dam, weir, or barrier in a river, having an opening in it fitted with nets or other appliances for catching fish.

Apparently: a type of weir. Cf. pight, adj. 1b, foot weir n. at foot, n. int.compounds 3.

Esp. in catchwater drain. A ditch designed to channel water for irrigation or drainage, esp. on a hillside; (also) a drain which carries away surplus…

A weir on a river, esp. one to divert water into a mill race.

a weir or cauld on a river for diverting the water into a mill-race.

A structure in a canal, dam, etc., to allow the water to overflow when it reaches a certain level, or to keep the water up to the required level.

a weir fitted with movable paddles or shutters (as distinguished from a solid weir).

a type of movable weir consisting of one or more leaves pivoted about a horizontal axis at or towards the bottom and held nearly vertical until…