(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, ²⁹₁₄Si, having fourteen protons and fifteen neutrons; it amounts to almost 5% 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

(pathology) silicosis-related tuberculosis.

(inorganic chemistry) A chemical compound with the formula SiO. In the atmosphere it oxidizes quickly into SiO₂, but has been detected in stellar objects and has been described as the most common oxide of silicon in the universe.

plural of silicon wafer

Treated or coated with silicone.

plural of silicone rubber

(chemistry, archaic) germanium

plural of silicoflagellate