| annex | (noun) an addition that extends a main building | Synonyms: annexe, extension, wing |
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| antapex | (noun) the point opposite in direction from the solar apex; the point the solar system is moving away from | - |
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| apex | (noun) the highest point (of something) | Synonyms: acme, peak, vertex |
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| (noun) the point on the celestial sphere toward which the sun and solar system appear to be moving relative to the fixed stars | Synonyms: apex of the sun's way, solar apex |
| auspex | (noun) (ancient Rome) a religious official who interpreted omens to guide public policy | Synonyms: augur |
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| caudex | (noun) woody stem of palms and tree ferns | - |
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| (noun) persistent thickened stem of a herbaceous perennial plant | Synonyms: stock |
| centrex | (noun) (CENTRal EXchange) a kind of telephone exchange | - |
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| circumflex | (noun) a diacritical mark (^) placed above a vowel in some languages to indicate a special phonetic quality | - |
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| codex | (noun) an unbound manuscript of some ancient classic (as distinguished from a scroll) | Synonyms: leaf-book |
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| (noun) an official list of chemicals or medicines etc. | - |
| complex | (noun) a whole structure (as a building) made up of interconnected or related structures | Synonyms: building complex |
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| (noun) a conceptual whole made up of complicated and related parts | Synonyms: composite |
| (noun) (psychoanalysis) a combination of emotions and impulses that have been rejected from awareness but still influence a person's behavior | - |
| (noun) a compound described in terms of the central atom to which other atoms are bound or coordinated | Synonyms: coordination compound |
| cortex | (noun) the tissue forming the outer layer of an organ or structure in plant or animal | - |
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| (noun) the layer of unmyelinated neurons (the grey matter) forming the cortex of the cerebrum | Synonyms: cerebral cortex, cerebral mantle, pallium |
| (noun) the tissue that surrounds the lens nucleus | Synonyms: lens cortex |
| cybersex | (noun) sexual arousal involving communication on the internet | - |
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| duplex | (noun) an apartment having rooms on two floors that are connected by a staircase | Synonyms: duplex apartment |
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| (noun) a house with two units sharing a common wall | Synonyms: duplex house, semidetached house |
| ex | (noun) the 24th letter of the Roman alphabet | Synonyms: X, x |
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| (noun) a woman who was formerly a particular man's wife | Synonyms: ex-wife |
| (noun) a man who was formerly a certain woman's husband | Synonyms: ex-husband |
| flex | (noun) the act of flexing | - |
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| googolplex | (noun) a cardinal number represented as 1 followed by a googol of zeros (ten raised to the power of a googol) | - |
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| hex | (noun) an evil spell | Synonyms: curse, jinx, whammy |
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| ibex | (noun) wild goat of mountain areas of Eurasia and northern Africa having large recurved horns | Synonyms: Capra ibex |
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| index | (noun) the finger next to the thumb | Synonyms: forefinger, index finger |
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| (noun) an alphabetical listing of names and topics along with page numbers where they are discussed | - |
| (noun) a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time | Synonyms: index number, indicant, indicator |
| (noun) a mathematical notation indicating the number of times a quantity is multiplied by itself | Synonyms: exponent, power |
| (noun) a numerical scale used to compare variables with one another or with some reference number | - |
| intersex | (noun) one having both male and female sexual characteristics and organs; at birth an unambiguous assignment of male or female cannot be made | Synonyms: androgyne, epicene, epicene person, gynandromorph, hermaphrodite |
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| isolex | (noun) an isogloss marking off the area in which a particular item of vocabulary is found. | - |
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| latex | (noun) a water-base paint that has a latex binder | Synonyms: latex paint, rubber-base paint |
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| (noun) a milky exudate from certain plants that coagulates on exposure to air | - |
| 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 | - |
| neocortex | (noun) the cortical part of the neencephalon | Synonyms: neopallium |
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| paleocortex | (noun) the olfactory cortex of the cerebrum | Synonyms: archipallium |
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| 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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| 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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| 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 | - |
| 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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| spandex | (noun) an elastic synthetic fabric | - |
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| suffrutex | (noun) low-growing woody shrub or perennial with woody base | Synonyms: subshrub |
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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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| 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 |