apparatus

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apparatus

1. a collection of instruments, machines, tools, parts, or other equipment used for a particular purpose
2. a machine having a specific function
3. Anatomy any group of organs having a specific function
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

apparatus

[‚ap·ə′rad·əs]
(science and technology)
A compound instrument designed to carry out a specific function.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
4) Severe Periodontitis is defined as greater than 50% of the total attachment apparatus of a tooth has been lost.
The attachment apparatus, that is, the alveolar bone, the tooth, and periodontal ligaments supporting the tooth in the alveolus, has to withstand all these forces.
But in a nutshell it can be said that any lesion that after performing endodontic treatment results in irreversible reactions in the attachment apparatus and requires periodontic treatment.