Protein decompiler

From Memory Alpha, the free Star Trek reference

A protein decompiler is a piece of scientific equipment.

Before realizing that Odo was a sentient lifeform, Doctor Mora Pol subjected him to a protein decompiler in an attempt to determine his true nature. This highly unpleasant experience contributed to Odo's bitterness towards Pol in later years. (DS9: "The Begotten")