perceived noise decibel
1. a combining form meaning “breath, respiration,” used in the formation of compound words that denote a kind of breathing or condition of the respiratory system, as specified by the initial element: dyspnea; hyperpnea. -pnea suff. Breath; respiration: dyspnea.
pneum- pref. Variant of pneumo-.
1. variant of before a vowel.
- Pneumatic bone
pneumatic bone n. A bone that is hollow or contains many air cells, such as the mastoid process of the temporal bone. Also called hollow bone.