- 1. Specifically, a morbid condition in which respiration can be performed only in an erect posture; by extension, any difficulty of breathing. Source: webster
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orthopnoea
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ortho-orthoboric acidorthocarbonicorthocenterorthocerasorthoceratiteorthochoreaorthochromatic filmorthoclaseorthoclasticorthodiagonalorthodomeorthodontiaorthodontic
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