greyline

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English[edit]

Alternative forms[edit]

Etymology[edit]

From grey +‎ line.

Noun[edit]

greyline (uncountable)

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

Related terms[edit]