F-layer
noun
The highest and most strongly ionized region of the ionosphere.
Origin
1920s: arbitrary use of F + layer.
- water toll
- water toothpick
- water torch
- water tortoise
- water torture
- water tower
- Watertown
- water toy
- water transport
- water treader
- water treatment
- water tree
- water trompe
- water tube
- water-tube boiler
- water tunnel
- water tupelo
- water turbine
- water-tyrant
- water under the bridge (or water over the dam)
- water vapor
- water vapour
- water-vascular
- water-vascular system
- water vessel