saddle seat

noun
a chair seat having a double slope downward from a central ridge highest at the front.

Origin:
1890–95

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
saddle seat

noun
a chair seat that is slightly concave and sometimes has a thickened ridge in the center; "the saddle seat fitted his buttocks nicely" 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
The maximum size and weight limits have been reduced and requirements for a saddle seat and handlebars added.
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