greyline

G2R1E1Y4L1I1N1E1

noun

A transition line, coinciding with a twilight zone (terminator), where a change in the propagation of radio waves is observed.

Similar
twilight zone
Scrabble 12
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Meanings

noungreyline (uncountable)

alternative grayline

  1. uncountablestrictlyengineeringA transition line, coinciding with a twilight zone (terminator), where a change in the propagation of radio waves is observed.
  2. broadlyuncountableSynonym of twilight zone (“terminator”).

    Synonyms: twilight zone

Synonyms & antonyms

nounSynonym of twilight zone (“terminator”).

Similar
twilight zone

Origin

From grey + line.

Full word history & related roots →
Cite this entry
APA

greyline. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/greyline

MLA

“greyline.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/greyline. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “greyline,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/greyline.

Source: greyline on Wiktionary, CC BY-SA 4.0.