plural of open-topper

Having an open top. / (of a vehicle) Having no roof, or having a top folded or detached.

(UK) A double-deck bus with an open, or partially open, top deck.

plural of opening night

(Of an object) that opens, or is designed to open automatically, or opens of its own accord.

plural of door opener

The control mechanism by which a door is latched and unlatched. / Any of various devices to automatically open a door in response to a sensor or signal sent from a controller.

(chess) Synonym of Ruy Lopez

(law) A requisite condition of adverse possession stipulating that the disseisor's occupation of the property must be visible and provide reasonable (if tacit) notice to the disseisee.

(physics) index (on a tensor) that isn't summed over