(informal, Internet slang, text messaging) Abbreviation of right now.

(healthcare) Initialism of registered nurse; also R.N.

(UK, military, nautical) Initialism of Royal Navy. / Abbreviation of Rio Grande do Norte, a state of Brazil.

(informal, Internet slang, text messaging) Alternative form of RN (“right now”)

(abbreviation) reactive nitrogen species / (slang) Real Nigga Shit

plural of RN

(US) Initialism of National Council Licensure Examination for Registered Nurses.

Censored spelling of porn.

(biochemistry) Initialism of ribonucleic acid.

(biochemistry) RNA that encodes and carries information from DNA during transcription to sites of protein synthesis to undergo translation in order to yield a protein.