1. The lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves
   - D region

Type of: part, region

Part of: ionosphere

Encyclopedia: D-layer

• thrice
• thrift
• thrift institution
• thriftily
• thriftiness
• thriftless
• thriftlessly
• thriftlessness
• thriftshop
• thrifty
• thrill
• thrilled
• thriller
• thrillful
• thrilling
• thrillingly
• Thrinax
• Thrinax keyensis
• Thrinax microcarpa
• Thrinax morrisii
• Thrinax parviflora
• thrip
• thripid
• Thripidae
• thrips