(1):

(n.) Any trench, channel, or groove, as in wood or metal; a wrinkle on the face; as, the furrows of age.

(2):

(n.) To mark with channels or with wrinkles.

(3):

(n.) To cut a furrow in; to make furrows in; to plow; as, to furrow the ground or sea.

(4):

(n.) A trench in the earth made by, or as by, a plow.