WordReference Random House Unabridged Dictionary of American English © 2026
RR Lyrae star,
- Astronomyone of a group of pulsating variable stars found in the halo of the Milky Way, with periods between 1.2 and 30 hours;
all have approximately the same luminosity and are therefore used for measuring distances. Also called cluster variable.
- Neo-Latin: RR (variable star designation) of Lyra
'RR Lyrae star' also found in these entries (note: many are not synonyms or translations):