fur·row 
(fûrō, fŭrō)
(fûrō, fŭrō)n.
1. A long, narrow, shallow trench made in the ground by a plow.
2. A rut, groove, or narrow depression: snow drifting in furrows.
3. A deep wrinkle in the skin, as on the forehead.
v. fur·rowed, fur·row·ing, fur·rows
v.tr.
1. To make long, narrow, shallow trenches in; plow.
2. To form grooves or deep wrinkles in.
v.intr.
To become furrowed or wrinkled.
[Middle English forwe, from Old English furh.]