We found one dictionary that defines the word flat back posture:

Medicine (1 matching dictionary)

1. flat back posture: Medical dictionary

▸ Words similar to flat back posture ▸ Usage examples for flat back posture ▸ Idioms related to flat back posture ▸ Wikipedia articles (New!) ▸ Words that often appear near flat back posture ▸ Rhymes of flat back posture ▸ Invented words related to flat back posture