Definition of digesters:
(n) :
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..
(n) :
One who, or that which, digests.
(n) :
A biodigester.
(n) :
(dated) A medicine or food that aids digestion, or strengthens digestive power.