Webster’s Revised Unabridged Dictionary · 1913
Hogback
Hog′back′ (hŏg′băk′), 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.