(architecture) The external covering at the top of a building. / The top external level of a building. / The upper part of a cavity.

(transitive) To cover or furnish with a roof. / To traverse buildings by walking or climbing across their roofs. / (transitive, slang) To put into prison, to bird.

(mathematics) The number which, when squared, yields another number. / (mathematics) The positive number which, when squared, yields another number; the principal square root.

The place where a bird sleeps (usually its nest or a branch). / A group of birds roosting together. / A bedroom / (Scotland) The inner roof of a cottage.

(intransitive, of birds or bats) To settle on a perch in order to sleep or rest / (figuratively) to spend the night

(Shetland and Orkney) A tidal race.

Alternative form of roust

Spacious, expansive, comfortable.

Alternative spelling of roomie

A normal temperature of a room in which people live; typically 20 to 23°C (68 to 73°F); neither heated nor chilled.