nrl nrem sleep • nrna · · · Info · Definitions · Characters · · nrl · · Text Latin · · Script 3 · · Length 1 · · Syllables Definitions · · · (noun) the United States Navy's defense laboratory that conducts basic and applied research for the Navy in a variety of scientific and technical disciplines. Synonyms: Naval Research Laboratory, NRL. · · Noun Definition 1 Characters · · l latin small letter l U+006C n latin small letter n U+006E r latin small letter r U+0072