be·low·ground 
(bĭ-lōground′)
(bĭ-lōground′)adj.
Situated or occurring below the surface of the ground: belowground telephone cables.
be·lowground′ adv.
- hyperemesis gravidarum
- hyperemia
- hyperemic
- hyperesthesia
- hyperesthetic
- hypereutectic
- hyperextend
- hyperextension
- hyperfiction
- hyperfine structure
- hypergamy
- hyperglycemia
- hyperglycemic
- hypergol
- hypergolic
- hypergolically
- hypergonadism
- hypericin
- hypericum
- hyperinflation
- hyperinflationary
- hyperinsulinemia
- hyperinsulinism
- Hyperion
- hyperirritability