| biconvex | (adjective) convex on both sides; shaped like a lentil | Synonyms: convexo-convex, lenticular, lentiform |
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| complex | (adjective) complicated in structure; consisting of interconnected parts | - |
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| (adjective) difficult to analyze or understand | Synonyms: complicated |
| convex | (adjective) curving or bulging outward | Synonyms: bulging |
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| duplex | (adjective) allowing communication in opposite directions simultaneously | - |
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| (adjective) (used technically of a device or process) having two parts | - |
| ex | (adjective) out of fashion | Synonyms: antique, demode, old-fashioned, old-hat, outmoded, passe, passee |
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| hex | (adjective) of or pertaining to a number system having 16 as its base | Synonyms: hexadecimal |
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| multiplex | (adjective) having many parts or aspects | - |
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| (adjective) many and varied; having many features or forms | Synonyms: manifold |
| planoconvex | (adjective) flat on one side and convex on the other | - |
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| quadruplex | (adjective) having four units or components | Synonyms: four-fold, fourfold, quadruple, quadruplicate |
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| reflex | (adjective) without volition or conscious control | Synonyms: automatic, reflexive |
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| retroflex | (adjective) bent or curved backward | Synonyms: retroflexed |
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| (adjective) pronounced with the tip of the tongue turned back toward the hard palate | Synonyms: cacuminal |
| simplex | (adjective) having only one part or element | - |
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| (adjective) allowing communication in only one direction at a time, or in telegraphy allowing only one message over a line at a time | - |
| triplex | (adjective) having three units or components or elements | Synonyms: ternary, treble, triple |
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| unisex | (adjective) not distinguished on the basis of sex | - |
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