What does «dorso» mean in Spanish?

Back or loin.
Reverse or back side of a thing.

Examples of use in Spanish: "el dorso de un escrito".

"el dorso de una moneda".

"al dorso del sobre se escribe el remite".
Upper part of certain organs or limbs; usually convex in shape.

Examples of use in Spanish: "dorso de la nariz", "dorso de la lengua", "dorso de la mano", "dorso del pie".
Backstroke swimming.

Examples of use in Spanish: "el nadador participó en la prueba de dorso".
Part of a garment that covers the back.

Examples of use in Spanish: "el dorso del vestido".