(astronomy) Initialism of luminous red nova: an astronomical event, believed to be a type of stellar explosion, intermediate in power between a nova and a supernova, and such that as the explosive debris expands it reddens and cools, unlike a nova or supernova, in which thinning explosive debris exposes hotter interior layers.

plural of LRN

(biochemistry) levo- (left-handed) RNA

Abbreviation of learned.