| OPA | the process of becoming cloudy or opaque |
|---|---|
| OPA | become opaque |
| OPA | make opaque |
| OPA | the quality of being opaque to a degree |
| OPA | incomprehensibility resulting from obscurity of meaning |
| OPA | the phenomenon of not permitting the passage of electromagnetic radiation |
| OPA | large elliptical brightly colored deep-sea fish of Atlantic and Pacific and Mediterranean |
| OPA | a translucent mineral consisting of hydrated silica of variable color |
| OPA | a milky white translucent or opaque glass |
| OPA | exhibit a play of colors like that of an opal |
| OPA | reflect light or colors like an opal |
| OPA | the visual property of something having a milky brightness |