hypogeal

American  

[hahy-puh-jee-uhl, hip-uh-] / ˌhaɪ pəˈdʒi əl, ˌhɪp ə- /

Also hypogean

adjective

1. underground; subterranean.

   hypogeal germination;

   hypogeal fungi.

---

hypogeal British  

/ ˌhaɪpəˈdʒiːəl /

adjective

1. occurring or living below the surface of the ground

2. botany of or relating to seed germination in which the cotyledons remain below the ground, because of the growth of the epicotyl

---

Etymology

Origin of hypogeal

First recorded in 1680–90; from Latin hypogē(us), from Greek hypógeios “underground, subterranean” (equivalent to hypo- + gê “earth” + -ios ) + -al; hypo-, geo- ( def. ), -al ¹

Example Sentences

The general character of the talamisan together with the presence of hypogeal cotyledons tends to the belief that this species has more or less united filaments and thus would belong to the first group.

From Project Gutenberg

Of the heat annually lost by our globe and dissipated into space, represented by 777 cubic miles of ice melted, as before stated, the chief part is derived from the actual hypogeal source of a hotter though not necessarily fused nucleus, and nearly, if not wholly, is quite independent of the heat of Vulcanicity, which is developed as a consequence of its loss or dissipation.

From Project Gutenberg

Here was a boundless supply of more than heat, of hot lava ready made, the existence of which at these moderate depths the then state of knowledge of hypogeal temperature, which was supposed to go on increasing with depth at the rate of about 1� Fahrenheit, for every thirty or forty feet, seemed quite to sustain.

From Project Gutenberg