semipronation

sem·i·pro·na·tion

(sem'ē-prō-nā'shŭn), The attitude or assumption of a partly prone position, as in Sims position.

semipronation

S05-848860 (sĕm″ē-prō-nā′shŭn) [″ + pronus, prone] 1. A semiprone position.2. The act of assuming a semiprone position.