digester

/D AY1 JH EH0 S T ER0/
noun
  1. 1

    One who, or that which, digests.

  2. 2

    A medicine or food that aids digestion, or strengthens digestive power.

  3. 3

    A strong closed vessel in which bones or other substances may be subjected, usually in water or other liquid, to a temperature above that of boiling, in order to soften them.

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