Technology / Motorcycle / Rigid: A bike with no rear suspension is said to be a rigid. Harley-Davidson motorcycles all had rigid frames until 1958 when the Duo-Glide was introduced. Most choppers are built using rigid frames.
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Rigid Adjective Synonyms: stiff, unbending, unbendable, firm, hard, strong
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Science / Psychiatry / Rigidity: An abnormal increase in the general tenseness of muscles that is not caused by anxiety or exercise. MORE
Business / Construction / Insulation Board, Rigid: A structural building board made of coarse wood or cane fiber in ½ - and 25/32-inch thickness. It can be obtained in various size sheets and densities. MORE