Etymology
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hyperventilate (v.)

"breathe deeply and rapidly," 1931, from hyper- "over, exceedingly, to excess" + ventilate in a medical sense. Perhaps a back-formation from ventilation. Earlier in a transitive sense, "to ventilate thoroughly" (1920 of lungs, 1906 of rooms). Related: Hyperventilated; hyperventilating.

updated on September 24, 2015

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Definitions of hyperventilate from WordNet

hyperventilate (v.)
produce hyperventilation in;
The nurses had to hyperventilate the patient
hyperventilate (v.)
breathe excessively hard and fast;
The mountain climber started to hyperventilate
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.