Greyline

noun

noun ·Rare ·Advanced level

Definitions

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

Synonyms

All synonyms
twilight zone

Etymology

From grey + line.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.