(pharmacology) The range of doses of a drug which are effective without being harmful.

Alternative spelling of window seat

A typically soft seat placed in a recess, for a window, in a wall, and filling the recess. / A seat beside a window in public transport, as in a bus, train or passenger aircraft.

A window that has the shape of a semicircle on top of a rectangle.

(architecture) A window space projecting outward from the main walls of a building and forming a bay in a room. / (figuratively) A protruding belly.

plural of bay window

plural of window cleaner

(space science) A period of time during which a spacecraft orbiting one celestial body can travel to a different body and enter orbit around it without excessive expenditure of fuel or reaction mass.

Any circular window, especially one of those found in churches of the Gothic architectural style and divided into segments by stone mullions and tracery.

plural of French window