Dry-point etching is one of the main intaglio processes. A metal stylus is used to draw directly upon a metal plate. Dry-point etching is prized for its "burr", which is the metal shaving turned up at the side of the furrow. The burr is usually scraped off in line engraving, but is left on in a dry-point because it catches the ink and prints with a richness that adds to the directness of the artist's work. Unfortunately, this burr is crushed further with each pass of the printing press, which limits the number of impressions that can be taken from the plate.
Sources: A Dictionary of Art and Artists, Peter & Linda Murray - Penguin Books, 1959; Encyclopaedia Britannica 2003 Deluxe Edition CD-ROM. Copyright © 1994-2002 Encyclopędia Britannica, Inc.