What does "digester" mean?

Digester: A medicine or an article of food that aids digestion, or strengthens digestive power. Rice is . . . a great restorer of health, and a great digester. Sir W. Temple.

Additional senses

  1. 2.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.

Sources