| aviatrix | (noun) a woman aviator | Synonyms: airwoman, aviatress |
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| cicatrix | (noun) a mark left (usually on the skin) by the healing of injured tissue | Synonyms: cicatrice, scar |
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| dominatrix | (noun) a dominating woman (especially one who plays that role in a sadomasochistic sexual relationship) | - |
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| executrix | (noun) a woman executor | - |
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| inheritrix | (noun) a female heir | Synonyms: heiress, inheritress |
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| matrix | (noun) mold used in the production of phonograph records, type, or other relief surface | - |
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| (noun) the formative tissue at the base of a nail | - |
| (noun) the body substance in which tissue cells are embedded | Synonyms: ground substance, intercellular substance |
| (noun) (mathematics) a rectangular array of quantities or expressions set out by rows and columns; treated as a single element and manipulated according to rules | - |
| (noun) an enclosure within which something originates or develops | - |
| (noun) (geology) a mass of fine-grained rock in which fossils, crystals, or gems are embedded | - |
| mediatrix | (noun) a woman who is a mediator | - |
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| negotiatrix | (noun) a woman negotiator | Synonyms: negotiatress |
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| separatrix | (noun) a punctuation mark (/) used to separate related items of information | Synonyms: diagonal, slash, solidus, stroke, virgule |
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| testatrix | (noun) a female testator | - |
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| tortrix | (noun) small Indian moth infesting e.g. tea and coffee plants | Synonyms: Homona coffearia, tea tortrix |
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| (noun) California moth whose larvae live in especially oranges | Synonyms: Argyrotaenia citrana, orange tortrix |
| varix | (noun) abnormally enlarged or twisted blood vessel or lymphatic vessel | - |
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