An Etymological Dictionary of the German Language/Annotated/Singrün

by Friedrich Kluge

Singrün, neuter, ‘periwinkle,’ Modern High German only, properly a Low German word; compare Anglo-Saxon and Middle English singrêne, Old Icelandic sí-grœ́nn, ‘semperviva’; sin, ‘always,’ is an Old Teutonic prefix connected with Latin sem-per. Compare Sündflut.