(slang, computing) A rogue system administrator who abuses users of the system.

(Canada) An illegal marijuana-growing operation, usually indoors.

plural of grow operation

A type of evening glove, meaning a glove that is especially long.

Alternative form of operations research

plural of open and shut case

(literally) Total outdoor sunshine, without clouds, haze, or other obstruction. / (figuratively) Openness, transparency, public awareness.

Alternative spelling of horse opera

(construction) The period of time after an adhesive has been applied and allowed to dry, during which an effective bond can be achieved by joining the two surfaces.

(roofing) a method of valley construction in which the steep-slope roofing on both sides are trimmed along each side of the valley, exposing the metal valley flashing.