This is the 11698th most frequent French word.
selle
"Selle" in English means "saddle" (for riding) or "stool" (feces).
Here, 'selle' specifically refers to a saddle, an object used for riding animals such as horses.
Je pose la selle sur le dos du cheval.
I place the saddle on the horse's back.
In this medical context, 'selle' refers to stools or excrement.
Le patient a des troubles de la selle.
The patient has stool irregularities.
This usage of 'selle' pertains to the saddle of a bicycle, a seat designed for cycling.