Meaning of operculated

1. The operculated shell of the snail helps protect it from predators.
2. The operculated fruit of the coffee plant is difficult to open.
3. The operculated lid on the jar was sealed tightly shut.
4. The operculated design of the clam shell allows it to open and close easily.
5. The operculated wings on the insect enable it to fly quickly.
6. The operculated cover on the container kept the contents fresh.
7. The operculated structure of the seedpod helps disperse the seeds.
8. The operculated valve on the engine needed to be replaced.
9. The operculated mechanism on the trapdoor allowed it to open and close smoothly.
10. The operculated seal on the letter ensured its contents remained confidential.