¦ noun
1. a long, narrow hilltop, mountain range, or watershed.
the edge formed where the two sloping sides of a roof meet at the top.
2. a narrow raised band on a surface.
a raised strip of arable land, especially one of a set separated by furrows.
3. Meteorology an elongated region of high barometric pressure.
¦ verb [often as adjective ridged] mark with or form into ridges.
Derivatives
ridgy adjective
Origin
OE hrycg 'spine, crest', of Gmc origin.