Meaning of retroussage

ret•rous•sage

Pronunciation: (re"tru-säzh' Fr. ru-tr&oomacr-sazh'), [key]
— n.
  1. the technique or action, in etching or engraving, of drawing up ink from within the incised lines of an inked plate by deftly passing a soft cloth across its surface in order to spread ink to the adjacent areas.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.