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digester US English

A container in which substances are treated with heat, enzymes, or a solvent in order to promote decomposition or extract essential components

pulp digester US English

A machine for producing paper pulp by boiling wood or other plant material with chemicals which dissolve away extraneous material to leave the fibrous pulp.

Papin's digester US English

A strong, sealable container in which bones or other matter can be broken down or dissolved by heating in water or other fluid at a temperature and pressure above those of the normal boiling point.