The Collaborative International Dictionary of English v.0.48:

Pore \Pore\, n. [F., fr. L. porus, Gr. ? a passage, a pore. See
   Fare, v.]
   1. One of the minute orifices in an animal or vegetable
      membrane, for transpiration, absorption, etc.
      [1913 Webster]

   2. A minute opening or passageway; an interstice between the
      constituent particles or molecules of a body; as, the
      pores of stones.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pore \Pore\, v. i. [imp. & p. p. Pored; p. pr. & vb. n.
   Poring.] [OE. poren, of uncertain origin; cf. D. porren to
   poke, thrust, Gael. purr.]
   To look or gaze steadily in reading or studying; to fix the
   attention; to be absorbed; -- often with on or upon, and now
   usually with over."Painfully to pore upon a book." --Shak.
   [1913 Webster]

         The eye grows weary with poring perpetually on the same
         thing.                                   --Dryden.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pore
    n 1: any tiny hole admitting passage of a liquid (fluid or gas)
    2: any small opening in the skin or outer surface of an animal
    3: a minute epidermal pore in a leaf or stem through which gases
       and water vapor can pass [syn: stoma, stomate, pore]
    v 1: direct one's attention on something; "Please focus on your
         studies and not on your hobbies" [syn: concentrate,
         focus, center, centre, pore, rivet]

Moby Thesaurus II by Grady Ward, 1.0:

94 Moby Thesaurus words for "pore":
   Eustachian tube, Fallopian tube, aperture, avenue, blowhole,
   broaching, canal, cavity, channel, chasm, check, chute, clearing,
   cleft, con, crack, debouch, disclosure, door, duct, egress,
   emunctory, escape, estuary, examine, exhaust, exit, fenestra,
   fistula, floodgate, flume, fontanel, foramen, gap, gape, gat,
   go over, gulf, hiatus, hole, hollow, inlet, interval, intestines,
   lacuna, laying open, leak, loophole, meatus, opening, opening up,
   orifice, ostium, out, outcome, outfall, outgate, outgo, outlet,
   oviduct, passageway, perforation, peruse, pore over, port, read,
   sally port, salpinx, scrutinize, slot, sluice, space, spiracle,
   split, spout, stoma, study, tap, thoracic duct, throwing open,
   uncorking, unstopping, ureter, urethra, vagina, vas, vent, ventage,
   venthole, vessel, vomitory, way out, weir, yawn