Etymology
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apnea (n.)

in pathology, "suspension of breathing," originally, and until recently most commonly, apnoea, 1719, Modern Latin, from Greek apnoia "absence of respiration," from apnoos "without breathing, without wind," from a- "not, without" (see a- (3)) + pnein "to breathe" (see pneuma).

updated on January 28, 2017

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Definitions of apnea from WordNet

apnea (n.)
transient cessation of respiration;
From wordnet.princeton.edu, not affiliated with etymonline.