The Collaborative International Dictionary of English v.0.48:

Pacinian \Pa*cin"i*an\, a. (Anat.)
   Of, pertaining to, or discovered by, Filippo Pacini
   (1812-1883), an Italian physician of the 19th century.
   [1913 Webster]

   Pacinian corpuscles, small oval bodies terminating some of
      the minute branches of the sensory nerves in the skin of
      the fingers, mesentery, integument and other parts of the
      body; the corpuscula lamellosa; called also Vater's
      corpuscles and Vater-Pacini corpuscles. They are
      sensitive to pressure, and supposed to be tactile organs.
      [1913 Webster +PJC]