1.1(Of seed germination) with the seed leaves remaining below the ground.
- Examples of hypogeal germination are seen in oak and runner bean.
- If hypogeal, the cotyledon remains below ground at germination, feeding a tiny growing bulb from the endosperm.
Late 17th century: via late Latin from Greek hupogeios (from hupo 'under' + gē 'earth') + -al.
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