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A rectangular block on the frieze of a Doric entablature, with two V-shaped vertical grooves instead of the three more commonly found in the triglyphs of other classical styles.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
A member having two vertical channels or grooves, without the two lateral half grooves which characterize the triglyph.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.