Definition of

Semiconductor

  1. (noun, artifact) a conductor made with semiconducting material
  2. (noun, substance) 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

via WordNet, Princeton University

Origin of the word Semiconductor

  1. 1838, "material whose electrical conductivity is between that of a conductor and that of an insulator," from semi- + conductor. Modern very specific sense is recorded from 1931. more

via Online Etymology Dictionary, ©2001 Douglas Harper

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Especially

to a distinctly greater extent or degree than is common