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silicon, silicone Definition
siliconnoun 1. (symbol Si, atomic number 14) a non-metallic element that occurs naturally as silicate minerals in clays and rocks, and as silica in sand and quartz, used as a semiconductor to make transistors and silicon chips for the integrated circuits of computers, etc.
Etymology: Early 19c: from Latin
silex flint.
Info:
These words are often confused with each other.