Word.ws English Dictionary

greyline

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

Noun

greyline (uncountable)

  1. (strictly) A transition line, coinciding with a twilight zone (terminator), where a change in the propagation of radio waves is observed.
  2. (broadly) Synonym of twilight zone (“terminator”).
    Synonyms:
    twilight zone

Synonyms of greyline

Forms of greyline

alternative formgrayline

Origin of greyline

From grey + line.

Questions about greyline

What does greyline mean?
Greyline means a transition line, coinciding with a twilight zone (terminator), where a change in the propagation of radio waves is observed.
What part of speech is greyline?
Greyline is a noun.

Words near greyline in the dictionary

  1. greylag geese
  2. greylag goose
  3. greylags
  4. greylead
  5. greyleads
  6. greyline
  7. greylist
  8. greylisted
  9. greylisting
  10. greylists
  11. greyly

Source and license

Adapted from Wiktionary: greyline (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

Last updated:

Cite this entry: “greyline.” Word.ws, https://word.ws/greyline. Based on Wiktionary, CC BY-SA 4.0.