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arris fillet[′ar·əs ¦fil·ət]
A triangular wooden piece that raises the slates of a roof against a chimney or wall so that rain runs off.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A triangular batten used to tilt up the lowest course of slates on a roof, at the edge of gutters.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.