Term: silicon: 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
Broader: semiconductor: a substance as germanium or silicon whose electrical conductivity is intermediate between that of a metal and an insulator; its conductivity increases with temperature and in the presence of impurities | Unrelated: medicine: the branches of medical science that deal with nonsurgical techniques
Broader: semiconductor: a substance as germanium or silicon whose electrical conductivity is intermediate between that of a metal and an insulator; its conductivity increases with temperature and in the presence of impurities | Unrelated: kiggelaria: small genus of South African shrubs or small trees