The Collaborative International Dictionary of English v.0.48:

Surf \Surf\, n.
   The bottom of a drain. [Prov. Eng.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Surf \Surf\, n. [Formerly spelled suffe, and probably the same
   word as E. sough.]
   The swell of the sea which breaks upon the shore, esp. upon a
   sloping beach.
   [1913 Webster]

   Surf bird (Zool.), a ploverlike bird of the genus
      Aphriza, allied to the turnstone.

   Surf clam (Zool.), a large clam living on the open coast,
      especially Mactra solidissima (syn. Spisula
      solidissima). See Mactra.

   Surf duck (Zool.), any one of several species of sea ducks
      of the genus Oidemia, especially Oidemia
      percpicillata; -- called also surf scoter. See the Note
      under Scoter.

   Surf fish (Zool.), any one of numerous species of
      California embiotocoid fishes. See Embiotocoid.

   Surf smelt. (Zool.) See Smelt.

   Surf whiting. (Zool.) See under Whiting.
      [1913 Webster]

WordNet (r) 3.0 (2006):

surf
    n 1: waves breaking on the shore [syn: surf, breaker,
         breakers]
    v 1: ride the waves of the sea with a surfboard; "Californians
         love to surf" [syn: surfboard, surf]
    2: look around casually and randomly, without seeking anything
       in particular; "browse a computer directory"; "surf the
       internet or the world wide web" [syn: browse, surf]
    3: switch channels, on television [syn: surf, channel-surf]

Moby Thesaurus II by Grady Ward, 1.0:

62 Moby Thesaurus words for "surf":
   billow, bore, breakers, chop, choppiness, chopping sea, collar,
   comb, comber, dirty water, eagre, foam, froth, gravity wave,
   ground swell, head, heave, heavy sea, heavy swell, lather, lift,
   lop, meringue, mousse, offscum, peak, popple, puff, riffle, ripple,
   rise, roll, roller, rough water, scend, scud, scum, sea, sea foam,
   send, soapsuds, souffle, spindrift, spoondrift, spray, spume,
   stinging, suds, surge, swell, tidal bore, tidal wave, tide wave,
   trough, tsunami, undulation, water wave, wave, wavelet,
   white horses, white water, whitecaps



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

SURF
       System Utilization Reporting Facility


The Jargon File (version 4.4.7, 29 Dec 2003):

surf
 v.

    [from the ?surf? idiom for rapidly flipping TV channels] To traverse the
    Internet in search of interesting stuff, used esp. if one is doing so with
    a World Wide Web browser. It is also common to speak of surfing in to a
    particular resource.

    Hackers adopted this term early, but many have stopped using it since it
    went completely mainstream around 1995. The passive, couch-potato
    connotations that go with TV channel surfing were never pleasant, and
    hearing non-hackers wax enthusiastic about ?surfing the net? tends to make
    hackers feel a bit as though their home is being overrun by ignorami.