hog·back 
(hôgbăk′, hŏg-)
(hôgbăk′, hŏg-)n.
A sharp ridge with steeply sloping sides, produced by erosion of the broken edges of highly tilted strata.
- double-knit
- double negative
- doubleness
- double-park
- double-parker
- double play
- double pneumonia
- double possessive
- double-quick
- doubler
- double reed
- double-reed
- double refraction
- double replacement
- double reverse
- double rhyme
- double salt
- double sharp
- double-space
- doublespeak
- double standard
- double star
- double-stop
- doublet
- double-take