horse·back 
(hôrsbăk′)
(hôrsbăk′)n.
1. The back of a horse.
2. A natural ridge; a hogback.
adv. & adj.
On the back of a horse: rode horseback to town; horseback riding.
- magnesia
- magnesian
- magnesite
- magnesium
- magnesium carbonate
- magnesium hydroxide
- magnesium oxide
- magnesium sulfate
- magnet
- magnet-
- magnet-
- magnetar
- magnetic
- magnetically
- magnetic bottle
- magnetic bubble memory
- magnetic card
- magnetic charge
- magnetic compass
- magnetic core
- magnetic declination
- magnetic dip
- magnetic disk
- magnetic equator
- magnetic field