The Collaborative International Dictionary of English v.0.48:

Suture \Su"ture\, n. [L. sutura, fr. suere, sutum, to sew or
   stitch: cf. F. suture. See Sew to unite with thread.]
   1. The act of sewing; also, the line along which two things
      or parts are sewed together, or are united so as to form a
      seam, or that which resembles a seam.
      [1913 Webster]

   2. (Surg.)
      (a) The uniting of the parts of a wound by stitching.
      (b) The stitch by which the parts are united.
          [1913 Webster]

   3. (Anat.) The line of union, or seam, in an immovable
      articulation, like those between the bones of the skull;
      also, such an articulation itself; synarthrosis. See
      Harmonic suture, under Harmonic.
      [1913 Webster]

   4. (Bot.)
      (a) The line, or seam, formed by the union of two margins
          in any part of a plant; as, the ventral suture of a
          legume.
      (b) A line resembling a seam; as, the dorsal suture of a
          legume, which really corresponds to a midrib.
          [1913 Webster]

   5. (Zool.)
      (a) The line at which the elytra of a beetle meet and are
          sometimes confluent.
      (b) A seam, or impressed line, as between the segments of
          a crustacean, or between the whorls of a univalve
          shell.
          [1913 Webster]

   Glover's suture, Harmonic suture, etc. See under
      Glover, Harmonic, etc.
      [1913 Webster]

WordNet (r) 3.0 (2006):

suture
    n 1: an immovable joint (especially between the bones of the
         skull) [syn: suture, sutura, fibrous joint]
    2: a seam used in surgery [syn: suture, surgical seam]
    3: thread of catgut or silk or wire used by surgeons to stitch
       tissues together
    v 1: join with a suture; "suture the wound after surgery"

Moby Thesaurus II by Grady Ward, 1.0:

70 Moby Thesaurus words for "suture":
   animal fiber, ankle, articulation, artificial fiber, boundary,
   butt, capillament, cervix, cilium, cirrus, clinch, closure, cobweb,
   connecting link, connecting rod, connection, coupling, denier,
   dovetail, elbow, embrace, fancywork, fiber, fibrilla, filament,
   filamentule, flagellum, garment making, gliding joint, gossamer,
   hair, hank, hinge, hinged joint, hip, interface, join, joining,
   joint, juncture, knee, knuckle, link, miter, mortise, neck,
   needlework, pivot, pivot joint, rabbet, scarf, seam, sewing,
   shoulder, skein, stitch, stitchery, stitching, strand, symphysis,
   tendril, thread, threadlet, tie rod, toggle, toggle joint, union,
   web, weld, wrist