putamen

/P Y UW0 T EY1 M AH0 N/
noun
  1. 1

    A round structure located at the base of the forebrain, regulating movement and learning.

  2. 2

    A hard, shell-like covering.

  3. 3

    The shell of a nut; the stone of a drupe fruit; endocarp.

Source: https://en.wiktionary.org/wiki/putamen