The Collaborative International Dictionary of English v.0.48:

Brow \Brow\, v. t.
   To bound to limit; to be at, or form, the edge of. [R.]
   [1913 Webster]

         Tending my flocks hard by i' the hilly crofts
         That brow this bottom glade.             --Milton.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Brow \Brow\ (brou), n. [OE. browe, bruwe, AS. br[=u]; akin to
   AS. br[=ae]w, bre['a]w, eyelid, OFries. br[=e], D. braauw,
   Icel. br[=a], br[=u]n, OHG. pr[=a]wa, G. braue, OSlav.
   br[u^]v[i^], Russ. brove, Ir. brai, Ir. & Gael. abhra, Armor.
   abrant, Gr. 'ofry`s, Skr. bhr[=u]. Cf. Bray a bank,
   Bridge.]
   1. The prominent ridge over the eye, with the hair that
      covers it, forming an arch above the orbit.
      [1913 Webster]

            And his arched brow, pulled o'er his eyes,
            With solemn proof proclaims him wise. --Churchill.
      [1913 Webster]

   2. The hair that covers the brow (ridge over the eyes); the
      eyebrow.
      [1913 Webster]

            'T is not your inky brows, your brack silk hair.
                                                  --Shak.
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   3. The forehead; as, a feverish brow.
      [1913 Webster]

            Beads of sweat have stood upon thy brow. --Shak.
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   4. The general air of the countenance.
      [1913 Webster]

            To whom thus Satan with contemptuous brow. --Milton.
      [1913 Webster]

            He told them with a masterly brow.    --Milton.
      [1913 Webster]

   5. The edge or projecting upper part of a steep place; as,
      the brow of a precipice; the brow of a hill.
      [1913 Webster]

   To bend the brow, To knit the brows, to frown; to scowl.
      [1913 Webster]

WordNet (r) 3.0 (2006):

brow
    n 1: the part of the face above the eyes [syn: brow,
         forehead]
    2: the arch of hair above each eye [syn: eyebrow, brow,
       supercilium]
    3: the peak of a hill; "the sun set behind the brow of distant
       hills" [syn: hilltop, brow]

Moby Thesaurus II by Grady Ward, 1.0:

117 Moby Thesaurus words for "brow":
   acme, air, apex, apogee, bank, bean, bearing, board, border,
   bordure, brim, brink, cap, carriage, cast, cast of countenance,
   cilia, climax, cloud nine, coast, color, complexion, countenance,
   crest, crown, culmen, culmination, demeanor, dome, edge,
   extreme limit, extremity, face, facial appearance, favor,
   featheredge, feature, features, flange, forehead, frame, fringe,
   front, garb, guise, head, headpiece, heaven, heavens, height, hem,
   high noon, highest pitch, highest point, labellum, labium, labrum,
   ledge, limb, limbus, limit, lineaments, lines, lip, list, looks,
   marge, margin, maximum, meridian, mien, mountaintop, ne plus ultra,
   no place higher, noddle, noggin, noodle, noon, pate, peak,
   physiognomy, pinnacle, pitch, point, pole, poll, port, posture,
   presence, ragged edge, ridge, rim, sconce, selvage, seventh heaven,
   shore, side, sideline, skirt, sky, spire, stance, summit, tip,
   tip-top, top, traits, turn, upmost, upper extremity, uppermost,
   utmost, verge, vertex, very top, visage, zenith