op art also Op Art 
(ŏp)
(ŏp)n.
A school of abstract art characterized by the use of geometric shapes and brilliant colors to create optical illusions, as of motion, and free the art of all but visual associations.
[OP(TICAL) ART.]
- senopia
- senryu
- sensate
- sensated
- sensately
- sensation
- sensational
- sensationalism
- sensationalist
- sensationalistic
- sensationalization
- sensationalize
- sensationally
- sense
- sense datum
- sensei
- senseless
- senselessly
- senselessness
- sense of shame
- sense organ
- sense perception
- sensibility
- sensible
- sensible horizon