from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Located under the earth's surface; underground.
  • adj. Botany Of or relating to seed germination in which the cotyledons remain below the surface of the ground.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. existing or growing underground

from The Century Dictionary and Cyclopedia

  • Subterranean; underground; in botany, growing beneath the surface of the earth, as parts of plants, or in a few instances entire plants, as the truffle and the tuckahoe. Also hypogeous, hypogæous, hypogean, hypogæan.


From Latin hypogēus, from Greek hupogeios : hupo-, hypo- + , earth.
(American Heritage® Dictionary of the English Language, Fourth Edition)
hypo- +‎ -geal (Wiktionary)



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