Initialism of regular and frequent.

Alternative spelling of R & B

Abbreviation of rhythm and blues. / Ellipsis of contemporary R&B.

(organic chemistry) A crystalline sulfonic acid, HOC₁₀H₅(SO₃H)₂, derived from beta naphthol and used as a dye intermediate; 2-naphthol-3,6-disulfonic acid.

(physics, astronomy) The relatively rapid nucleosynthesis process, in supernovae, in which a large neutron flux allows rapid neutron capture and synthesis of elements up to the transuranic elements.

a Soviet rocket modelled on the V-2; the Scunner

Initialism of reserves-to-production.

(phonetics) An "r" sound that is like a linking r but occurs despite the absence of "r" in the spelling, as in Asia and the Far East in some pronunciations.

(as a closing in a message) Initialism of very respectfully.

(Internet slang) retard