birthline

B3I1R1T1H4L1I1N1E1

noun

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.

Scrabble 14
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Meanings

nounbirthline (plural birthlines)

plural birthlines

  1. astronomyA 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.

Origin

From birth + line.

Full word history & related roots →
Cite this entry
APA

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

MLA

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

Chicago

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

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