| basilica | (noun) a Roman building used for public administration | Synonyms: Roman basilica |
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| (noun) an early Christian church designed like a Roman basilica; or a Roman Catholic church or cathedral accorded certain privileges | - |
| basilisk | (noun) small crested arboreal lizard able to run on its hind legs; of tropical America | - |
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| (noun) ancient brass cannon | - |
| (noun) (classical mythology) a serpent (or lizard or dragon) able to kill with its breath or glance | - |
| borosilicate | (noun) a salt of boric and silicic acids | - |
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| dissilience | (noun) the emergence of seeds as seed pods burst open when they are ripe | - |
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| fluosilicate | (noun) salt of fluosilicic acid | - |
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| fossilisation | (noun) becoming inflexible or out of date | Synonyms: fossilization |
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| (noun) the process of fossilizing a plant or animal that existed in some earlier age; the process of being turned to stone | Synonyms: fossilization |
| fossilist | (noun) a specialist in paleontology | Synonyms: palaeontologist, paleontologist |
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| fossilization | (noun) becoming inflexible or out of date | Synonyms: fossilisation |
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| (noun) the process of fossilizing a plant or animal that existed in some earlier age; the process of being turned to stone | Synonyms: fossilisation |
| fusilier | (noun) (formerly) a British infantryman armed with a light flintlock musket | - |
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| resilience | (noun) the physical property of a material that can return to its original shape or position after deformation that does not exceed its elastic limit | Synonyms: resiliency |
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| (noun) an occurrence of rebounding or springing back | Synonyms: resiliency |
| resiliency | (noun) the physical property of a material that can return to its original shape or position after deformation that does not exceed its elastic limit | Synonyms: resilience |
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| (noun) an occurrence of rebounding or springing back | Synonyms: resilience |
| silica | (noun) a white or colorless vitreous insoluble solid (SiO2); various forms occur widely in the earth's crust as quartz or cristobalite or tridymite or lechatelierite | Synonyms: silicon dioxide, silicon oxide |
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| silicate | (noun) a salt or ester derived from silicic acid | - |
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| silicide | (noun) any of various compounds of silicon with a more electropositive element or radical | - |
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| silicle | (noun) short broad silique occurring in some cruciferous plants | - |
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| silicon | (noun) a tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a semiconductor in transistors | Synonyms: atomic number 14, Si |
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| silicone | (noun) any of a large class of siloxanes that are unusually stable over a wide range of temperatures; used in lubricants and adhesives and coatings and synthetic rubber and electrical insulation | Synonyms: silicone polymer |
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| silicosis | (noun) a lung disease caused by inhaling particles of silica or quartz or slate | - |
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| siliqua | (noun) narrow elongated seed capsule peculiar to the family Cruciferae | Synonyms: silique |
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| silique | (noun) narrow elongated seed capsule peculiar to the family Cruciferae | Synonyms: siliqua |
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