- The womb.
- The material or tissue in which more specialized structures are embedded.
- An extracellular matrix, the material or tissue between the cells of animals or plants.
- Part of the mitochondrion.
- The medium in which bacteria are cultured.
- A rectangular arrangement of numbers or terms having various uses such as transforming coordinates in geometry, solving systems of linear equations in linear algebra and representing graphs in graph theory.
- A two-dimensional array.
- A grid-like arrangement of electronic components, especially one intended for information coding, decoding or storage.
- A table of data.
- A geological matrix.
- The sediment surrounding and including the artifacts, features, and other materials at a site.
- The environment from which a given sample is taken.
- In hot metal typesetting, a mold for casting a letter.
- In printmaking, the plate or block used, with ink, to hold the image that makes up the print.
- The cavity or mold in which anything is formed.
- The five simple colours (black, white, blue, red, and yellow) from which all the others are formed.
- A binding agent of composite materials, e.g. resin in fibreglass.

- active matrix
- adjacency matrix
- biomatrix
- Cabibbo-Kobayashi-Maskawa matrix
- Cartan matrix
- CKM matrix
- diagonal matrix
- dot matrix
- eigenmatrix
- extracellular matrix
- geological matrix
- germinal matrix
- Hankel matrix
- Hermitian matrix
- Hessian matrix
- identity matrix
- incidence matrix
- inverse matrix
- invertible matrix
- Jacobian matrix
- Jordan matrix
- mitochondrial matrix
- nuclear matrix
- passive matrix
- Pauli matrix
- polymatrix
- right stochastic matrix
- singular matrix
- square matrix
- stochastic matrix
- symmetric matrix
- territorial matrix
- Toeplitz matrix
- transfer matrix
- transition matrix
- Tutte matrix
- unit matrix
- unitary matrix
- zero matrix

- From Middle English matris, matrice, matrix, from Old French matrice ("pregnant animal"), or from Latin mātrīx ("dam, womb"), from māter.

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