| 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 | - |
| borosilicate | (noun) a salt of boric and silicic acids | - |
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| filicide | (noun) the murder of your own son or daughter | - |
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| (noun) a parent who murders his own son or daughter | - |
| fluosilicate | (noun) salt of fluosilicic acid | - |
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| 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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| umbilical | (noun) membranous duct connecting the fetus with the placenta | Synonyms: umbilical cord |
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| umbilicus | (noun) a scar where the umbilical cord was attached | Synonyms: belly button, bellybutton, navel, omphalos, omphalus |
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