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 for Matrices
From The Collaborative International Dictionary of English v.0.48 :

  matrix \ma"trix\ (m[=a]"tr[i^]ks), n.; pl. Matrices
     (m[a^]t"r[i^]*s[=e]z). [L., fr. mater mother. See Mother,
     and cf. Matrice.]
     [1913 Webster]
     1. (Anat.) The womb.
        [1913 Webster]
              All that openeth the matrix is mine.  --Ex. xxxiv.
        [1913 Webster]
     2. Hence: That which gives form or origin to anything; as:
        (a) (Mech.) The cavity in which anything is formed, and
            which gives it shape; a die; a mold, as for the face
            of a type.
        (b) (Min.) The earthy or stony substance in which metallic
            ores or crystallized minerals are found; the gangue.
        (c) pl. (Dyeing) The five simple colors, black, white,
            blue, red, and yellow, of which all the rest are
            [1913 Webster]
     3. (Biol.) The lifeless portion of tissue, either animal or
        vegetable, situated between the cells; the intercellular
        [1913 Webster]
     4. (Math.) A rectangular arrangement of symbols in rows and
        columns. The symbols may express quantities or operations.
        [1913 Webster]

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