Palladian motif

Palladian motif

A door or window opening in three parts, divided by posts, featuring a round-headed archway flanked by narrow openings with a flat lintel over each side; the arched area rests on the flat entablatures.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

Palladian motif, Serlian motif, Venetian motif

A door or window opening in three parts, divided by posts, with a lintel flat over each side but arched over the center.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.