A surgical operation
Opus (before a number given to each work of a particular composer, usually indicating the order of publication)
variant spelling of ob- assimilated before p (as in oppress, oppugn).
(Of a book) out of print
A cooperative society, shop, business, or farm
A newspaper page opposite the editorial page, devoted to personal comment, feature articles, etc.
A form of abstract art that gives the illusion of movement by the precise use of pattern and colour, or in which conflicting patterns emerge and overlap. Bridget Riley and Victor Vasarely are its most famous exponents
short for preoperative.
A machine which is operated by the insertion of coins
short for opportunity shop.
In the work already cited
informal term for photo opportunity.
An amplifier with high gain and high input impedance (usually with external feedback), used especially in circuits for performing mathematical operations on an input voltage
Operated by inserting coins in a slot
A machine that is coin-operated