greyline
A transition line, coinciding with a twilight zone, where a change in the propagation…A transition line, coinciding with a twilight zone (terminator), where a change in the propagation of radio waves is observed.
Meaning
2 senses(uncountable)A transition line, coinciding with a twilight zone (terminator), where a change in the propagation of radio waves is observed.
(broadly, uncountable)Synonym of twilight zone (“terminator”).
Origin
From grey + line.From grey + line.
Wiktionary, CC BY-SA 4.0 · source
Synonyms
1 synonymsWord family
1 related wordsRelatedgrey area
Lessons for this word
1 lessons- A1Countable and uncountable nouns — Because it can be uncountable