The Collaborative International Dictionary
Platband \Plat"band`\, n. [F. plate-bande; plat, plate, flat, level + bande a band.]
A border of flowers in a garden, along a wall or a parterre; hence, a border.
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(Arch.)
A flat molding, or group of moldings, the width of which much exceeds its projection, as the face of an architrave.
A list or fillet between the flutings of a column.
Wiktionary
n. 1 A border of flowers in a garden, especially along a wall; a strip of turf forming a border. 2 (context figuratively English) Any border. 3 (context architecture English) A flat fascia on an architrave, or forming a border round a window, or a horizontal band along a wall. 4 (context architecture English) A fillet on a column, between the flutings. 5 (context rare English) A flat lintel over a door or window.