F region
noun
: the highest region of the ionosphere occurring from 80 miles (130 kilometers) to more than 300 miles (500 kilometers)
Word History
First Known Use
1923, in the meaning defined above
- mountain andromeda
- mountain antelope
- mountain apple
- mountain ash
- mountain asp
- mountain avens
- mountain badger
- mountain balm
- mountain balsam
- mountain banana
- mountain barometer
- mountain battery
- mountain beaver
- mountain beech
- mountain bicycle
- mountain bicycling
- mountain bicyclist
- mountain bike
- mountain biker
- mountain bikes
- mountain biking
- mountain bindweed
- mountain birch
- mountain black snake
- mountain blue