bivouac noun

biv·ouac | \ˈbi-və-ˌwak,  ˈbiv-ˌwak\

1: a usually temporary encampment under little or no shelter

2: an encampment usually for a night

2: a temporary or casual shelter or lodging

bivouac verb

bivouacked; bivouacking

intransitive verb : to take shelter often temporarily

transitive verb : to provide temporary quarters for

A bivouac shelter is any of a variety of improvised camp site or shelter that is usually of a temporary nature, used especially by soldiers, persons engaged in scouting, mountain climbing, and adventuring.  A bivouac shelter is colloquially known as a bivy, bivvy, or bivi.

Bivouac Racing is an organization that aim to create fun, family-friendly adventures that focus as much on the bivouac as the event.