01 n. A narrow arm of the sea; an estuary; the opening of a river into the sea; as, the Frith of Forth. Also called firth.
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1.
A narrow arm of the sea; an estuary; the opening of a river into the sea; as, the Frith of Forth. Also called firth.(Geog.) Also: firth
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2.
A kind of weir for catching fish.[Eng.]