vi·a·duct 
(vīə-dŭkt′)
(vīə-dŭkt′)n.
A series of spans or arches used to carry a road or railroad over a wide valley or over other roads or railroads.
[Latin via, road; see VIA + (AQUE)DUCT.]
viaductthe Glacier Express train crossing the Landwasser viaduct in Switzerland
- hypoglossal
- hypoglossal nerve
- hypoglycemia
- hypoglycemic
- hypogonadism
- hypogynous
- hypogyny
- hypokalemia
- hypolimnetic
- hypolimnial
- hypolimnion
- hypolithic
- hypomania
- hypomanic
- hyponastic
- hyponasty
- hyponatremia
- hyponym
- hyponymic
- hyponymous
- hypopharynx
- hypophosphite
- hypophosphorous acid
- hypophyseal
- hypophysial