What is a gall produced on rosebushes, esp. on the sweetbrier or eglantine, by a puncture from the ovipositor of a gallfly (Rhodites rosæ). It was once supposed to have medicinal properties called?

bedegar — A gall produced on rosebushes, esp. on the sweetbrier or eglantine, by a puncture from the ovipositor of a gallfly (Rhodites rosæ). It was once supposed to have medicinal properties. (Webster's 1913.)