Stiffener 2 : Straight and slender thin walled member of uniform cross section containing at lest one plane of symmetry, which serves as a stiffening element for a flat plate structure. (Bul 2V)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}