plural of open problem

Alternative spelling of openwork

Any of several forms of metalwork or needlework having decorative openings. / (mining) A quarry; an open cut.

(optics) A method of designing optical systems in which the conformation of the lenses is chosen to optimize its interaction with the local environment

Initialism of other people's problems.

Initialism of Ontario Provincial Police, the police force of the Canadian province of Ontario.

One who opposes another physically (in a fight, sport, game, or competition). / One who opposes another in words (in a dispute, argument or controversy).

(obsolete) Opposing; adverse; antagonistic. / (obsolete) Situated in front; opposite.

(genetics) A sequence of DNA triplets, between the initiator and terminator codons, that can be transcribed into mRNA and later translated into protein.

alert and vigilant