[hahy-puh-jee-uhl, hip-uh-]
underground; subterranean.
Also, hypogaeal, hypogeous, hypogaeous.

1680–90; < Latin hypogē(us) (< Greek hypógeios underground, subterranean, equivalent to hypo- hypo- + earth + -ios adj. suffix) + -al1

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World English Dictionary
hypogeal or hypogeous (ˌhaɪpəˈdʒiːəl)
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
[C19: from Latin hypogēus, from Greek hupogeios, from hypo- + earth]
hypogeous or hypogeous
[C19: from Latin hypogēus, from Greek hupogeios, from hypo- + earth]

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Example sentences
Germination is hypogeal and the plumule is sensitive to light.
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