| mailbox | (noun) a private box for delivery of mail | Synonyms: letter box |
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| (noun) public box for deposit of mail | Synonyms: letter box, postbox |
| matchbox | (noun) a box for holding matches | - |
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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 | - |
| max | (noun) street names for gamma hydroxybutyrate | Synonyms: easy lay, Georgia home boy, goop, grievous bodily harm, liquid ecstasy, scoop, soap |
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| mediatrix | (noun) a woman who is a mediator | - |
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| meninx | (noun) a membrane (one of 3) that envelops the brain and spinal cord | Synonyms: meninges |
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| minx | (noun) a seductive woman who uses her sex appeal to exploit men | Synonyms: coquette, flirt, prickteaser, tease, vamp, vamper |
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| mix | (noun) the act of mixing together | Synonyms: admixture, commixture, intermixture, mixing, mixture |
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| (noun) an event that combines things in a mixture | Synonyms: mixture |
| (noun) a commercially prepared mixture of dry ingredients | Synonyms: premix |
| multiplex | (noun) a movie theater that has several different auditoriums in the same building | - |
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| (noun) communicates two or more signals over a common channel | - |
| narthex | (noun) a vestibule leading to the nave of a church | - |
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| (noun) portico at the west end of an early Christian basilica or church | - |
| nasopharynx | (noun) cavity forming the upper part of the pharynx | - |
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| negotiatrix | (noun) a woman negotiator | Synonyms: negotiatress |
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| neocortex | (noun) the cortical part of the neencephalon | Synonyms: neopallium |
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| nix | (noun) a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential | Synonyms: aught, cipher, cypher, goose egg, nada, naught, nil, nothing, null, zero, zilch, zip, zippo |
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| onyx | (noun) a chalcedony with alternating black and white bands; used in making cameos | - |
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| opopanax | (noun) an odorous gum resin formerly used in medicines | - |
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| oropharynx | (noun) cavity formed by the pharynx at the back of the mouth | - |
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| oryx | (noun) large African antelope with long straight nearly upright horns | Synonyms: pasang |
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| ox | (noun) any of various wild bovines especially of the genera Bos or closely related Bibos | Synonyms: wild ox |
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| (noun) an adult castrated bull of the genus Bos; especially Bos taurus | - |
| paintbox | (noun) a box containing a collection of cubes or tubes of artists' paint | - |
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| paleocortex | (noun) the olfactory cortex of the cerebrum | Synonyms: archipallium |
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| paradox | (noun) (logic) a statement that contradicts itself | - |
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| parallax | (noun) the apparent displacement of an object as seen from two different points that are not on a line with the object | - |
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| pax | (noun) (Roman Catholic Church) a greeting signifying Christian love for those assisting at the Eucharist | Synonyms: kiss of peace |
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| phalanx | (noun) any of the bones of the fingers or toes | - |
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| (noun) a body of troops in close array | - |
| (noun) any closely ranked crowd of people | - |
| pharynx | (noun) the passage to the stomach and lungs; in the front part of the neck below the chin and above the collarbone | Synonyms: throat |
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| phlox | (noun) any polemoniaceous plant of the genus Phlox; chiefly North American; cultivated for their clusters of flowers | - |
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| phoenix | (noun) a legendary Arabian bird said to periodically burn itself to death and emerge from the ashes as a new phoenix; according to most versions only one phoenix lived at a time and it renewed itself every 500 years | - |
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| (noun) a large monocotyledonous genus of pinnate-leaved palms found in Asia and Africa | Synonyms: genus Phoenix |
| pickax | (noun) a heavy iron tool with a wooden handle and a curved head that is pointed on both ends | Synonyms: pick, pickaxe |
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| pillbox | (noun) a small enclosed gun emplacement (usually of fortified concrete) | - |
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| (noun) a small case for holding pills | - |
| (noun) a small round woman's hat | Synonyms: toque, turban |
| pix | (noun) any receptacle in which wafers for the Eucharist are kept | Synonyms: pyx |
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| (noun) a chest in which coins from the mint are held to await assay | Synonyms: pix chest, pyx, pyx chest |
| playbox | (noun) a box for a child's toys and personal things (especially at a boarding school) | Synonyms: play-box |
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| pneumothorax | (noun) abnormal presence of air in the pleural cavity resulting in the collapse of the lung; may be spontaneous (due to injury to the chest) or induced (as a treatment for tuberculosis) | - |
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| poleax | (noun) a battle ax used in the Middle Ages; a long handled ax and a pick | Synonyms: poleaxe |
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| (noun) an ax used to slaughter cattle; has a hammer opposite the blade | Synonyms: poleaxe |
| pollex | (noun) the thick short innermost digit of the forelimb | Synonyms: thumb |
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| pontifex | (noun) a member of the highest council of priests in ancient Rome | - |
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| postbox | (noun) public box for deposit of mail | Synonyms: letter box, mailbox |
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| postfix | (noun) an affix that is added at the end of the word | Synonyms: suffix |
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| pox | (noun) a contagious disease characterized by purulent skin eruptions that may leave pock marks | - |
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| (noun) a common venereal disease caused by the treponema pallidum spirochete; symptoms change through progressive stages; can be congenital (transmitted through the placenta) | Synonyms: lues, lues venerea, syph, syphilis |
| prefix | (noun) an affix that is added in front of the word | - |
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| premix | (noun) a commercially prepared mixture of dry ingredients | Synonyms: mix |
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| prothorax | (noun) the anterior part of an insect's thorax; bears the first pair of legs | - |
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| pseudosmallpox | (noun) a mild form of smallpox caused by a less virulent form of the virus | Synonyms: alastrim, Cuban itch, Kaffir pox, milk pox, pseudovariola, variola minor, West Indian smallpox, white pox |
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| pyx | (noun) any receptacle in which wafers for the Eucharist are kept | Synonyms: pix |
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| (noun) a chest in which coins from the mint are held to await assay | Synonyms: pix, pix chest, pyx chest |
| radix | (noun) (numeration system) the positive integer that is equivalent to one in the next higher counting place | Synonyms: base |
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| rattlebox | (noun) any of various plants of the genus Crotalaria having inflated pods within which the seeds rattle; used for pasture and green-manure crops | Synonyms: crotalaria |
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| redox | (noun) a reversible chemical reaction in which one reaction is an oxidation and the reverse is a reduction | Synonyms: oxidation-reduction, oxidoreduction |
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| reflex | (noun) an automatic instinctive unlearned reaction to a stimulus | Synonyms: inborn reflex, innate reflex, instinctive reflex, physiological reaction, reflex action, reflex response, unconditioned reflex |
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| reflux | (noun) the outward flow of the tide | Synonyms: ebb |
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| (noun) an abnormal backward flow of body fluids | - |
| rickettsialpox | (noun) mild infectious rickettsial disease caused by a bacterium of the genus Rickettsia transmitted to humans by the bite a mite that lives on rodents; characterized by chills and fever and headache and skin lesions that resemble chickenpox | - |
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| roux | (noun) a mixture of fat and flour heated and used as a basis for sauces | - |
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| salpinx | (noun) a tube in the uterus or the ear | - |
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| saltbox | (noun) a type of house built in New England; has two stories in front and one behind | - |
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| sandbox | (noun) a plaything consisting of a pile of sand or a box filled with sand for children to play in | Synonyms: sandpile, sandpit |
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| (noun) mold consisting of a box with sand shaped to mold metal | - |
| sardonyx | (noun) an onyx characterized by parallel layers of sard and a different colored mineral | - |
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| sax | (noun) a single-reed woodwind with a conical bore | Synonyms: saxophone |
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| scramasax | (noun) A single-edged knife or sword used by the Anglo-Saxons for fighting and hunting. | Synonyms: scramaseax, scramsax |
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| scramaseax | (noun) A single-edged knife or sword used by the Anglo-Saxons for fighting and hunting. | Synonyms: scramasax, scramsax |
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| scramsax | (noun) A single-edged knife or sword used by the Anglo-Saxons for fighting and hunting. | Synonyms: scramasax, scramaseax |
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| seax | (noun) a type of sword or dagger typical of the Germanic peoples of the Migration period and the Early Middle Ages, especially the Saxons. | - |
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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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| sex | (noun) activities associated with sexual intercourse | Synonyms: sex activity, sexual activity, sexual practice |
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| (noun) the properties that distinguish organisms on the basis of their reproductive roles | Synonyms: gender, sexuality |
| (noun) all of the feelings resulting from the urge to gratify sexual impulses | Synonyms: sexual urge |
| (noun) either of the two categories (male or female) into which most organisms are divided | - |
| shoebox | (noun) an oblong rectangular (usually cardboard) box designed to hold a pair of shoes | - |
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| (noun) a structure resembling a shoebox (as a rectangular building or a cramped room or compartment) | - |
| silex | (noun) a pure form of finely ground silica | - |
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| silvex | (noun) a herbicide that is effective in controlling woody plants but is toxic to animals | - |
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| six | (noun) a playing card or domino or die whose upward face shows six pips | Synonyms: six-spot |
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| (noun) the cardinal number that is the sum of five and one | Synonyms: 6, Captain Hicks, half a dozen, hexad, sestet, sextet, sextuplet, sise, sixer, VI |
| skybox | (noun) an elevated box for viewing events at a sports stadium | - |
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| smallpox | (noun) a highly contagious viral disease characterized by fever and weakness and skin eruption with pustules that form scabs that slough off leaving scars | Synonyms: variola, variola major |
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| smilax | (noun) fragile twining plant of South Africa with bright green flattened stems and glossy foliage popular as a floral decoration | Synonyms: Asparagus asparagoides |
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| snuffbox | (noun) a small ornamental box for carrying snuff in your pocket | - |
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| soapbox | (noun) a platform raised above the surrounding level to give prominence to the person on it | Synonyms: ambo, dais, podium, pulpit, rostrum, stump |
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| (noun) a crate for packing soap | - |
| soundbox | (noun) a resonating chamber in a musical instrument (as the body of a violin) | Synonyms: body |
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| spadix | (noun) the fleshy axis of a spike often surrounded by a spathe | - |
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| spandex | (noun) an elastic synthetic fabric | - |
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| sphinx | (noun) one of a number of large stone statues with the body of a lion and the head of a man that were built by the ancient Egyptians | - |
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| (noun) an inscrutable person who keeps his thoughts and intentions secret | - |
| storax | (noun) a vanilla-scented resin from various trees of the genus Styrax | - |
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| strongbox | (noun) a strongly made box for holding money or valuables; can be locked | Synonyms: deedbox |
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| styrax | (noun) any shrub or small tree of the genus Styrax having fragrant bell-shaped flowers that hang below the dark green foliage | - |
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| suffix | (noun) an affix that is added at the end of the word | Synonyms: postfix |
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| suffrutex | (noun) low-growing woody shrub or perennial with woody base | Synonyms: subshrub |
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| supertax | (noun) an additional tax on certain kinds of income that has already been taxed | Synonyms: surtax |
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| surtax | (noun) an additional tax on certain kinds of income that has already been taxed | Synonyms: supertax |
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| sweatbox | (noun) a device that causes tobacco leaves or fruit or hides to sweat | - |
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| (noun) small or narrow cell | - |
| syntax | (noun) studies of the rules for forming admissible sentences | - |
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| (noun) the grammatical arrangement of words in sentences | Synonyms: phrase structure, sentence structure |
| (noun) a systematic orderly arrangement | - |
| syrinx | (noun) the vocal organ of a bird | - |
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| (noun) a primitive wind instrument consisting of several parallel pipes bound together | Synonyms: pandean pipe, panpipe |
| tax | (noun) charge against a citizen's person or property or activity for the support of government | Synonyms: revenue enhancement, taxation |
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| telex | (noun) a character printer connected to a telegraph that operates like a typewriter | Synonyms: teleprinter, teletype machine, teletypewriter, telex machine |
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| testatrix | (noun) a female testator | - |
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| thorax | (noun) part of an insect's body that bears the wings and legs | - |
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| (noun) the part of the human torso between the neck and the diaphragm or the corresponding part in other vertebrates | Synonyms: chest, pectus |
| (noun) the middle region of the body of an arthropod between the head and the abdomen | - |
| tinderbox | (noun) a box for holding tinder | - |
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| (noun) a dangerous state of affairs; a situation that is a potential source of violence | - |
| toadflax | (noun) common European perennial having showy yellow and orange flowers; a naturalized weed in North America | Synonyms: butter-and-eggs, devil's flax, Linaria vulgaris, wild snapdragon |
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| toolbox | (noun) a box or chest or cabinet for holding hand tools | Synonyms: tool cabinet, tool case, tool chest |
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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 |
| tux | (noun) semiformal evening dress for men | Synonyms: black tie, dinner jacket, tuxedo |
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| varix | (noun) abnormally enlarged or twisted blood vessel or lymphatic vessel | - |
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| vernix | (noun) a white cheeselike protective material that covers the skin of a fetus | Synonyms: vernix caseosa |
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| vertex | (noun) the point of intersection of lines or the point opposite the base of a figure | - |
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| (noun) the highest point (of something) | Synonyms: acme, apex, peak |
| vortex | (noun) a powerful circular current of water (usually the result of conflicting tides) | Synonyms: maelstrom, whirlpool |
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| (noun) the shape of something rotating rapidly | Synonyms: convolution, swirl, whirl |
| vox | (noun) the sound made by the vibration of vocal folds modified by the resonance of the vocal tract | Synonyms: phonation, vocalisation, vocalism, vocalization, voice |
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| wax | (noun) any of various substances of either mineral origin or plant or animal origin; they are solid at normal temperatures and insoluble in water | - |
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