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

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