Ex-pān'sion-joint, n.
n. 1. (Steam-eng.) A pipe so formed as to be compressed endwise by the expansion of the metal by heat. The copper end a of the iron pipe b bends without injury as the whole, or its attachments, expand or contract.
Expansion-joint. a, joint; b, stuffing-box.
Sense 2. (Locomotive-eng.) An attachment of the framing to the boiler, which allows the boiler to expand without bending the framing.
