plural of open sesame

A straight razor.

plural of open razor

(topology) Informally, a set such that the target point of a movement by a small amount in any direction from any point in the set is still in the set; exemplified by a full circle without its boundary.

partially open; ajar / (mathematics) (referring to an interval on the real line) containing only one of its endpoints

A ceremony to mark the official opening of a building or event.

Any dish consisting of only one slice of bread, with any topping.

plural of open secret

Third-person singular simple present indicative form of open-source

simple past tense and past participle of open-source