rapidshell
nounUK /ˈræpɪdʃɛl/
US /ˈræpɪdʃɛl/
A rapidshell is a small shell that moves very fast in the water.
The little crab hid inside a rapidshell on the beach.
OTHER MEANINGS
2. A type of light, fast-moving boat or craft.
They raced the rapidshell down the river.
3. A computer program that runs commands very quickly.
He opened a rapidshell to type the command.
4. A quick, hard outer covering on an animal.
The turtle's rapidshell helped it escape danger.