Digester

Noun

1. One who, or that which, digests.
2. A vessel for converting materials, especially plant and animal matter, into materials more suitable for subsequent use or further processing, using solvents, especially water; relatively low heat; enyzymes; bacteria, etc..
3. (Should we delete this sense?) A biodigester.
4. A medicine or food that aids digestion, or strengthens digestive power.