hypogeal

From Ancient Greek ὑπόγειος (hupógeios) +‎ -al.

hypogeal (comparative more hypogeal, superlative most hypogeal)

1. Existing or growing underground
2. (botany, of a cotyledon) Remaining under the surface of the ground after having germinated

• hypogean, hypogeous

• epigeal

• hypogeally