noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A predicted line on the Hertzsprung-Russell diagram that relates the effective temperature and luminosity of pre-main-sequence stars at the start of their contraction.

Etymology

From birth + line.

Related phrases

hertzsprung russell diagrammain sequence

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