The Collaborative International Dictionary of English v.0.48:

Hornyhead \Horn"y*head`\, n. (Zool.)
   Any North American river chub of the genus Hybopsis, esp.
   Hybopsis biguttatus.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Jerker \Jerk"er\, n.
   [1913 Webster]
   1. A beater. [Obs.] --Beau. & Fl.
      [1913 Webster]

   2. One who jerks or moves with a jerk.
      [1913 Webster]

   3. (Zool.) A North American river chub (Hybopsis
      biguttatus).
      [1913 Webster]