1. silicon dioxide

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
chert flint silicon oxide silex vitreous silica tridymite quartz lechatelierite silica quartz glass oxide crystal cristobalite
Antonyms
softhearted

2. dioxide

noun. (daɪˈɑːkˌsaɪd) An oxide containing two atoms of oxygen in the molecule.
Synonyms
sulfur dioxide sulphur dioxide carbonic acid gas nitrogen dioxide CO2 chlorine dioxide oxide carbon dioxide
Etymology
dioxide (English)
di- (English)
δία (Ancient Greek (to 1453))
δίς (Ancient Greek (to 1453))
oxide (English)

3. silicon

noun. (ˈsɪləkən) 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
granite semiconductor chemical element Si silicone polymer semiconducting material feldspar atomic number 14 clay quartz silicone sand element felspar
Antonyms
unsteadiness insulator roughen software curve
Etymology
silicon (English)
silex (Latin)
silica (English)
silex (Irish)
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