| circumflex | (noun) a diacritical mark (^) placed above a vowel in some languages to indicate a special phonetic quality | - |
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| 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 |
| 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 |
| 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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| isolex | (noun) an isogloss marking off the area in which a particular item of vocabulary is found. | - |
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| 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 | - |
| pollex | (noun) the thick short innermost digit of the forelimb | Synonyms: thumb |
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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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| silex | (noun) a pure form of finely ground silica | - |
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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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