The Collaborative International Dictionary of English v.0.48:
Camber \Cam"ber\, n. [Of. cambre bent, curved; akin to F.
cambrer to vault, to bend, fr. L. camerare to arch over, fr.
camera vault, arch. See Chamber, and cf. Camerate.]
1. (Shipbuilding) An upward convexity of a deck or other
surface; as, she has a high camber (said of a vessel
having an unusual convexity of deck).
2. (Arch.) An upward concavity in the under side of a beam,
girder, or lintel; also, a slight upward concavity in a
straight arch. See Hogback.
Camber arch (Arch.), an arch whose intrados, though
apparently straight, has a slightly concave curve upward.
Camber beam (Arch.), a beam whose under side has a concave