The Collaborative International Dictionary of English v.0.48:

Springbok \Spring"bok`\ (-b[o^]k`), Springbuck \Spring"buck`\
   (-b[u^]k`), n. [D. springbok; springen to spring, leap + bok
   a he-goat, buck.] (Zool.)
   A South African gazelle (Gazella euchore) noted for its
   graceful form and swiftness, and for its peculiar habit of
   springing lightly and suddenly into the air. It has a white
   dorsal stripe, expanding into a broad patch of white on the
   rump and tail. Called also springer. [Written also
   springboc, and springbock.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Springer \Spring"er\ (spr[i^]ng"[~e]r), n.
   1. One who, or that which, springs; specifically, one who
      rouses game.
      [1913 Webster]

   2. A young plant. [Obs.] --Evelyn.
      [1913 Webster]

   3. (Arch.)
      (a) The impost, or point at which an arch rests upon its
          support, and from which it seems to spring. Hence:
      (b) The bottom stone of an arch, which lies on the impost.
          The skew back is one form of springer.
      (c) The rib of a groined vault, as being the solid
          abutment for each section of vaulting.
          [1913 Webster]

   4. (Zool.) The grampus.
      [1913 Webster]

   5. (Zool.) A variety of the field spaniel. See Spaniel.
      [1913 Webster]

   6. (Zool.) A species of antelope; the springbok.
      [1913 Webster]

WordNet (r) 3.0 (2006):

springer
    n 1: the lowest stone in an arch -- from which it springs [syn:
         springer, impost]
    2: a cow about to give birth [syn: springer, springing cow]
    3: a large spaniel with wavy silky coat usually black or liver
       and white [syn: springer spaniel, springer]