What it means
The beginning of words about standing straight or being set right. In orthopneaor-THOP-nee-uhDifficulty breathing when lying flat that eases when sitting or standing up.ortho- upright-pnea breathingFull entry it means upright, because the breathing is easier sitting or standing up; in orthostatic hypotension it means standing, and in orthopedics it means straightening bones.