opaqu- +

Function: trademark; used for a preparation of metrizoate sodium.

Not opaque; especially, allowing the passage of radiation (as X rays); radiolucent.

The state of being opaque, or the degree to which something is opaque.

1. Not clear; not transmitting or reflecting light or radiant energy, sound, heat, etc.
2. Not clearly understood or expressed; not clear or lucid; obscure.
3. Impervious to light; not translucent or only slightly so.
4. Not allowing light to pass through.
5. Not shining or bright; dark; dull.
6. Dull, stupid, or unintelligent.

In an opaque manner

1. The quality of being opaque to a degree.
2. The degree to which something reduces the passage of light.
3. Incomprehensibility resulting from obscurity of meaning.

A substance (for example metal) will be highlighted (appear white) on a plain X-ray. The use of iodine containing radiopaque contrast dyes allow enhancement of the anatomy demonstrable with conventional X-ray.

Partly, partially, or nearly opaque.