'Fork beam' definitions:

Definition of 'Fork beam'

From: GCIDE

Fork \Fork\ (f[^o]rk), n. [AS. forc, fr. L. furca. Cf. Fourch['e], Furcate.]
1. An instrument consisting of a handle with a shank terminating in two or more prongs or tines, which are usually of metal, parallel and slightly curved; -- used for piercing, holding, taking up, or pitching anything. [1913 Webster]
2. Anything furcate or like a fork in shape, or furcate at the extremity; as, a tuning fork. [1913 Webster]
3. One of the parts into which anything is furcated or divided; a prong; a branch of a stream, a road, etc.; a barbed point, as of an arrow. [1913 Webster]
Let it fall . . . though the fork invade The region of my heart. --Shak. [1913 Webster]
A thunderbolt with three forks. --Addison. [1913 Webster]
4. The place where a division or a union occurs; the angle or opening between two branches or limbs; as, the fork of a river, a tree, or a road. [1913 Webster]
5. The gibbet. [Obs.] --Bp. Butler. [1913 Webster]
Fork beam (Shipbuilding), a half beam to support a deck, where hatchways occur.
Fork chuck (Wood Turning), a lathe center having two prongs for driving the work.
Fork head. (a) The barbed head of an arrow. (b) The forked end of a rod which forms part of a knuckle joint.
In fork. (Mining) A mine is said to be in fork, or an engine to "have the water in fork," when all the water is drawn out of the mine. --Ure.
The forks of a river or The forks of a road, the branches into which it divides, or which come together to form it; the place where separation or union takes place. [1913 Webster]