listel
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fillet
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fillet, 1
1. A molding consisting of a narrow flat band, often square in section; the term is loosely applied to almost any rectangular molding; usually used in conjunction with or to separate other moldings or ornaments, as the stria between the flutes of columns. Also see band, lattice molding, fret, reglet, annulet, supercilium, taenia, cincture, cimbia, fascia, and platband; a listel, or tringle.
2. A carved ornament representing a flowing band or ribbon.
3. In stair construction, a thin narrow strip of wood which fits into the groove of the stair shoe or subrail between balusters.
4. A cant strip.
5. A concave junction where two surfaces meet. (See illustration p. 398.)
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.