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

Syn: D region. [WordNet 1.5]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • D layer — n. the lowest area of the ionosphere, having increased ion density and existing only in the daytime: it begins at an altitude of about 70 km (c. 43 mi) and merges with the E layer …   English World dictionary

  • D layer — /ˈdi leɪə/ (say dee layuh) noun the innermost layer of the ionosphere, 50–90 km above the surface of the earth; absorbs high frequency radio waves particularly during the day. Compare E layer, F layer …   Australian English dictionary

  • d layer — noun Usage: usually capitalized D 1. : a layer that may exist within the D region of the ionosphere; also : d region 2. : d horizon …   Useful english dictionary

  • D layer — noun Date: circa 1934 a layer within the D region of the ionosphere; also D region …   New Collegiate Dictionary

  • D-layer — n. the lowest layer of the ionosphere able to reflect low frequency radio waves. Etymology: D (arbitrary) * * * noun the lowest region of the ionosphere (35 to 50 miles up) that reflects low frequency radio waves • Syn: ↑D region • Instance… …   Useful english dictionary

  • D-layer — noun the lowest layer of the ionosphere, able to reflect low frequency radio waves. Origin 1930s: from an arbitrary use of the letter D …   English new terms dictionary

  • D layer — A part of the ionosphere. It is a region of increasing electron and ion density, which exists primarily during the day. It merges with the bottom layers of the E layer. Its average height lies between 50 and 100 km (30 and 60 miles), and it… …   Aviation dictionary

  • D layer — the lowest region of the ionosphere, characterized by mounting electron and ion density: exists, during the day only, from about 43 to 50 mi. (70 to 80 km) altitude. Cf. D region. [1930 35] * * * …   Universalium

  • D layer — n. phs the lowest region of the ionosphere, at an altitude of ab. 50 mi. (80 km) • Etymology: 1930–35 …   From formal English to slang

  • layer — [ leje ] v. tr. <conjug. : 8> • 1307; probablt du frq. °lakan « munir d une marque indiquant une limite » ♦ Techn. 1 ♦ Faire traverser par un layon. Layer une forêt. Par ext. Délimiter (une superficie de bois) par une laie périphérique. 2 ♦ …   Encyclopédie Universelle

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