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.
Unable to record the eerie sounds of pigeons in their hypogeal nests, I messed a little with the audio qualities of these spaces myself, with an able assist from the_child.
This contrasts with hypogeal germination, for example, in peaches and maize, in which the cotyledon remains underground and the new shoot grows up above (Figure 6.10).
Dicotyledons usually store reserve-food in their cotyledons, which may in germination remain below ground (_hypogeal_).
Time lapse Broad bean hypogeal germination and root growth