greyline

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English

English Wikipedia has articles on:

terminator (solar) and terminator (solar) § Grey-line radio propagation

Wikipedia Wikipedia

Alternative forms

grayline

Etymology

From grey +‎ line.

Noun

greyline (uncountable)

(strictly, technical) A transition line, coinciding with a twilight zone (terminator), where a change in the propagation of radio waves is observed.
(loosely) Synonym of twilight zone (“terminator”).

Related terms

grey area

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