(slang) The porn industry of San Fernando Valley. / Misspelling of Silicon Valley.

(informal) Originally, the region of the San Francisco Bay Area in which there are a high number of industries producing silicon chips; later extended to mean the entire concentration of high-tech businesses in this area.

plural of vallum

(pathology) Coccidioidomycosis, a mammalian fungal disease caused by Coccidioides immitis or Coccidioides posadasii.

(medicine) A mosquito-borne, acute, febrile, viral disease of humans and animals, caused by an RNA virus of the genus Phlebovirus, which occurs in northern and eastern Africa.

(geology) A graben structure between two tectonic plates which are opening relative to each other. / (geology) A mid-oceanic ridge system with central valleys.

A city in Castile and León, Spain. / A province in Castile and León, Spain.

Of or relating to a rampart.

Meänkieli (language spoken by some 40,000–70,000 people in Northern Sweden)

The waste produced by mountain top removal mining. So named because it is typically piled high in nearby valleys.