a caterpillar that feeds on leaves or needles that it (or an adult insect) has rolled, folded, or tied together for shelter —note most leaf rollers are in the moth families Tortricidae and Olethreutidae; important species include the oak leaf roller (Archils semiferana) and budworms in the third to fifth instars —synonym leaf folder, leaftier, needle roller, needle tier This definition last updated 07/11/2008