Quick Quiz: Nouns Score: Change category, Flip order Reset Incorrect! Try again. Noun: dippel's oil Your choice? teasel with lilac flowers native to Old World but naturalized in North America; dried flower heads used to raise a nap on woolen cloth   (Noun: dipsacus fullonum) European teasel with white to pink flowers; naturalized in United States   (Noun: dipsacus sylvestris) dark-colored ill-smelling oil obtained by carbonizing bone; used especially in sheep dips and in denaturing alcohol (computer science) a listing of the files stored in memory (usually on a hard disk)