(mnemonic) An acronym used to remember the color sequence of the visible spectrum: red, orange, yellow, green, blue, indigo, violet.

An encampment for the night, usually without tents or covering. / Any temporary encampment. / A temporary shelter constructed generally for a few nights.

To set up camp. / To watch at night or be on guard, as a whole army. / To encamp for the night without tents or covering.

(chemistry) Having a valence of 2; having two ligands / (genetics) Of, or relating to a pair of homologous synapsed chromosomes that occur during meiosis.

(genetics) Any bivalent chromosome.

Any mollusc belonging to the taxonomic class Bivalvia, characterized by a shell consisting of two hinged sections, such as a scallop, clam, mussel or oyster.

A bivouac, a temporary camp.

plural of bivalve

A waterproof fabric shell designed to slip over a sleeping bag.

A vane that is doubly jointed so as to indicate both horizontal and vertical components of a fluid's flow