1. the quality or state of being opaque; lack of transparency
2. areas that block light or are not transparent, especially in medical imaging
Usage: medical
3. instances of being difficult to understand or unclear
Usage: formal

Examples

• The window’s opacities made it impossible to see through clearly.
• The chest X-ray showed several opacities in the lung tissue.
• The doctor pointed out the opacities on the scan that needed further investigation.
• The glass had developed opacities over time due to weathering.
• The legal document contained opacities that confused the readers.
• Multiple opacities appeared on the radiograph after the patient’s illness.