fret
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fret
1 the result of fretting; corrosion
fret
2 any of several small metal bars set across the fingerboard of a musical instrument of the lute, guitar, or viol family at various points along its length so as to produce the desired notes when the strings are stopped by the fingers
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
fret
An ornament usually in bands, but also covering broad surfaces, consisting of interlocking geometric motifs.

Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
fret
1. An ornament, sometimes painted, incised, or raised and formed of short fillets, bands, or reglets variously combined, frequently consisting of continuous lines arranged in rectangular forms; a meander; a Greek key.
2. Similar ornamentation in which the fillets intersect at oblique angles, as often in Oriental designs.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.