The cardinal number occurring after eight hundred ninety-nine and before nine hundred one, represented in Arabic numerals as 900. Ordinal: nine-hundredth.

(historical) Prior to police forces, a person appointed by a town or city to walk the streets at night and guard the burghers from felons and robbers.

Alternative spelling of 9-1-1

(euphemistic) A female prostitute. / Brunfelsia spp.

(UK, regional) A nightjar, especially Caprimulgus europaeus (Eurasian nightjar). / (US) A New World nightjar of the genus Chordeiles, especially Chordeiles minor.

Clothing worn while sleeping in bed, such as pyjamas or a nightgown, and, when worn over nightclothes, a robe.

A long loose robe worn mainly by women for sleeping in. / A dressing gown.

(especially of a cat) Durability; near immunity to damage; remarkable ability to survive.

(historical) A 5.9-inch artillery shell of the kind used by Germany in World War I.

sodium nitrate