Source : Webster's Revised Unabridged Dictionary (1913)

Puerco \Pu*er"co\, n. [Sp.]
   A hog.

   {Puerco beds} (Geol.), a name given to certain strata
      belonging to the earliest Eocene. They are developed in
      Northwestern New Mexico, along the Rio Puerco, and are
      characterized by their mammalian remains.