The Collaborative International Dictionary of English v.0.48:

Wristband \Wrist"band\, n.
   The band of the sleeve of a shirt, or other garment, which
   covers the wrist.
   [1913 Webster]

WordNet (r) 3.0 (2006):

wristband
    n 1: band consisting of a part of a sleeve that covers the wrist
    2: a band of cloth or leather or metal links attached to a
       wristwatch and wrapped around the wrist [syn: watchband,
       watchstrap, wristband, watch bracelet, bracelet]

Moby Thesaurus II by Grady Ward, 1.0:

53 Moby Thesaurus words for "wristband":
   anklet, armlet, band, bangle, beads, belt, bijou, bracelet,
   breastpin, brooch, chain, chaplet, charm, chatelaine, cincture,
   cingulum, circle, collar, collarband, coronet, crown, diadem,
   earring, ecliptic, equator, fascia, fillet, finger ring, fob, gem,
   girdle, girt, girth, great circle, hoop, jewel, locket, neckband,
   necklace, nose ring, pin, precious stone, quoit, rhinestone, ring,
   stickpin, stone, tiara, torque, wampum, wristlet, zodiac, zone