The Collaborative International Dictionary of English v.0.48:

Sprig \Sprig\ (spr[i^]g), n. [AS. sprec; akin to Icel. sprek a
   stick. Cf. Spray a branch.]
   1. A small shoot or twig of a tree or other plant; a spray;
      as, a sprig of laurel or of parsley.
      [1913 Webster]

   2. A youth; a lad; -- used humorously or in slight
      disparagement.
      [1913 Webster]

            A sprig whom I remember, with a whey-face and a
            satchel, not so many years ago.       --Sir W.
                                                  Scott.
      [1913 Webster]

   3. A brad, or nail without a head.
      [1913 Webster]

   4. (Naut.) A small eyebolt ragged or barbed at the point.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sprig \Sprig\, v. t. [imp. & p. p. Sprigged (spr[i^]gd); p.
   pr. & vb. n. Sprigging (-g[i^]ng).]
   To mark or adorn with the representation of small branches;
   to work with sprigs; as, to sprig muslin.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sprigtail \Sprig"tail`\ (spr[i^]g"t[=a]l`), n. (Zool.)
   (a) The pintail duck; -- called also sprig, and
       spreet-tail. [Local, U.S.]
   (b) The sharp-tailed grouse. [Local, U.S.]
       [1913 Webster]

WordNet (r) 3.0 (2006):

sprig
    n 1: a small branch or division of a branch (especially a
         terminal division); usually applied to branches of the
         current or preceding year [syn: branchlet, twig,
         sprig]
    2: an ornament that resembles a spray of leaves or flowers

Moby Thesaurus II by Grady Ward, 1.0:

68 Moby Thesaurus words for "sprig":
   adolescent, appendage, arm, baby, bine, bough, branch,
   branchedness, branchiness, burgeon, deadwood, flagellum, fledgling,
   fork, frond, hand, hopeful, imp, infant, joint, junior, juvenal,
   juvenile, leg, limb, link, lobe, lobule, member, minor, offshoot,
   organ, pinion, pubescent, ramage, ramification, runner, sapling,
   sarment, scion, seedling, set, shoot, slip, spear, spray, sprit,
   sprout, spur, stolon, stripling, sucker, switch, tail, teenager,
   teener, teenybopper, tendril, thallus, twig, wing, young hopeful,
   young person, younger, youngest, youngling, youngster, youth