It turns out that that saut de chat is a commonly used term to describe grand jeté developpé. To avoid confusion, the movement is illustrated below. This ballet jump is performed/practiced as part of grande allegro exercises. A high degree of flexibility and strength is required to achieve a full split position in mid-air.
As a medical professional, I would describe this as a jump involving anterior leg hip flexion and anterior knee extension from a flexed position with simultaneous posterior leg hip extension with knee in extension.
All this to say, movement and spoken language are fluid and highly stylized. That's why choreographers and dancers have their signature styles.
(Note: this is not to be confused with pas de chat which is the step of the cat and in the Cecchetti Method requires starting from a 5th position. It begins with raising the foot in raccourci derriere, at the height of the jump with both legs in high passé, landing on the starting foot with the other foot in raccourci devant, closing in demi-plie in fifth position.)