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Eupnaea
Eupnaea Eup*n[ae]"a, n. [NL., fr. gr. ? easy breathing; ? well
+ ? to breathe.] (Physiol.)
Normal breathing where arterialization of the blood is
normal, in distinction from dyspn[ae]a, in which the blood is
insufficiently arterialized. --Foster.
Meaning of Eupnaea from wikipedia