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late 14c., "uterus, womb," from Old French matrice "womb, uterus," from Latin matrix (genitive matricis) "pregnant animal," in Late Latin "womb," also "source, origin," from mater (genitive matris) "mother" (see mother (n.1)). Sense of "place or medium where something is developed" is first recorded 1550s; sense of "embedding or enclosing mass" first recorded 1640s. Logical sense of "array of possible combinations of truth-values" is attested from 1914. As a verb from 1951.
matrix ma·trix (mā'trĭks)
n. pl. ma·trix·es or ma·tri·ces (mā'trĭ-sēz', māt'rĭ-)
A surrounding substance within which something else originates, develops, or is contained.
The formative cells or tissue of a fingernail, toenail, or tooth.
See ground substance.
A specially shaped instrument, plastic material, or metal strip for holding and shaping the material used in filling a tooth cavity.
Plural matrices (mā'trĭ-sēz', māt'rĭ-) or matrixes