siderography
n. எஃகின் மேற் செய்யப்படும் செதுக்கு வேலைப்பாட்டுப்பாணி.
Sid`er*og"ra*phy, n. Etym: [Gr. -graphy.] Defn: The art or practice of steel engraving; especially, the process, invented by Perkins, of multiplying facsimiles of an engraved steel plate by first rolling over it, when hardened, a soft steel cylinder, and then rolling the cylinder, when hardened, over a soft steel plate, which thus becomes a facsimile of the original. The process has been superseded by electrotypy.