\Frith\, n. [OE. firth, Icel. fj["o]r?r; akin to Sw.
fj["a]rd, Dan. fiord, E. ford. [root]78. See {Ford}, n., and
cf. {Firth}, {Fiord}, {Fret} a frith, {Port} a harbor.]
1. (Geog.) A narrow arm of the sea; an estuary; the opening
   of a river into the sea; as, the Frith of Forth.
2. A kind of weir for catching fish. [Eng.] --Carew.

\Frith\, n. [OE. frith peace, protection, land inclosed
for hunting, park, forest, AS. fri? peace; akin to freno?
peace, protection, asylum, G. friede peace, Icel. fri?r, and
from the root of E. free, friend. See {Free}, a., and cf.
{Affray}, {Defray}.]
1. A forest; a woody place. [Obs.] --Drayton.
2. A small field taken out of a common, by inclosing it; an
   inclosure. [Obs.] --Sir J. Wynne.