1. (in histology) The substance of a tissue or organ such as dentine.
2. A mechanical or artificial wall or mould used to support a plastic material; it may be in the form of a strip (see matrix band) or a mould approximating the external surface of the tooth (sectional matrix).
3. The female part of a precision attachment.
4. (in statistics) A mathematical table containing a collection of numbers arranged in rows and columns.
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