Source : Webster's Revised Unabridged Dictionary (1913)

Hypernoea \Hy`per*n[oe]"a\, n. [NL., fr. Gr. "ype`r over + ?, ?,
   breath.] (Physiol.)
   Abnormal breathing, due to slightly deficient arterialization
   of the blood; -- in distinction from eupn[oe]a. See
   {Eupn[oe]a}, and {Dispn[oe]a}.