hy·pop·ne·a (hī-pŏpnē-ə, hī′pō-nēə)
Abnormally slow, shallow breathing.
[HYPO- + Greek pnoiā, -pnoia, breath, breathing (from pnein, to breathe; see pneu- in the Appendix of Indo-European roots).]
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Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.