Free US Law Dictionary

Res Ipsa Loquitur

Res ipsa loquitur is a legal term from the Latin meaning literally, "the thing itself speaks" but is more often translated "the thing speaks for itself". It signifies that further details are unnecessary; the proof of the case is self-evident. The doctrine is applied to tort claims which, as a matter of law, do not have to be explained beyond the point where liability is established. It is most useful to plaintiffs in certain negligence cases. It was first formulated in the case Byrne v. Boadle (1863), in England.