Sentence:  Meanwhile, we may observe that the most extraordinary example of <WSD>acrography</WSD> is a medallion of Addinos, engraved in a similar style to that of Collas's priest, and not distinguishable from its productions except by the liars being imperfect. 
Meaning of the word marked with <WSD> tags:  A method of relief etching on wood, metal, or stone by means of a coating of compressed chalk, invented by Louis Schonberg in 1841.