Replacement component

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM CORPUS ▪ He stood looking like a spare part , apparently waiting to be asked to sit down.

Wiktionary Word definitions in Wiktionary
n. A component of any manufactured goods, kept in reserve to replace one that fails; a spare.

WordNet Word definitions in WordNet
n. an extra component of a machine or other apparatus [syn: spare ]

Wikipedia Word definitions in Wikipedia
A spare part , spare , service part , repair part , or replacement part , is an interchangeable part that is kept in an inventory and used for the repair or replacement of failed units. Spare parts are an important feature of logistics engineering and supply ...