\Hog"back`\, n.
1. (Arch.) An upward curve or very obtuse angle in the upper
   surface of any member, as of a timber laid horizontally;
   -- the opposite of camber.
2. (Naut.) See {Hogframe}.
3. (Geol.) A ridge formed by tilted strata; hence, any ridge
   with a sharp summit, and steeply sloping sides.