The Collaborative International Dictionary
Siderographic
Siderographic \Sid`er*o*graph"ic\, Siderographical \Sid`er*o*graph"ic*al\, a. Of or pertaining to siderography; executed by engraved plates of steel; as, siderographic art; siderographic impressions.
Wiktionary
siderographic
a. Of or relating to siderography; executed by engraved plates of steel.