(computing, sciences) In computer simulation or in virtual reality.

(chemistry) silicon, silicone

Having undergone the silicoating process.

(dentistry) A technique for resin-metal bonding in dental prosthetics, involving silicon.

(chemistry) A hard glassy mineral, SiO₂, occurring as quartz, sand, opal etc. Informally known as silica.

(slang) computing / (slang) computer processor / Abbreviation of silicon chip.

(chemistry, uncountable) A nonmetallic element (symbol Si) with an atomic number of 14 and atomic weight of 28.0855. / (chemistry, countable) A single atom of this element.

(physics) A minor stable isotope of silicon, ²⁹₁₄Si, having fourteen protons and fifteen neutrons; it amounts to almost 5% of the element in nature

(physics) The major stable isotope of silicon, ²⁸₁₄Si, having fourteen protons and fourteen neutrons; it amounts to over 92% of the element in nature

(physics) A minor stable isotope of silicon, ³⁰₁₄Si, having fourteen protons and sixteen neutrons; it amounts to 3% of the element in nature