A shell-like cover or structure
An explosive projectile
A crustaceous covering
Shell conical without spire.
"Nothing... only a shell..." he answered.
grisea is greyish in tint and produces a spherical egg with a spiky shell, which also is dropped into the mud.
Cade was slowly emerging from his shell, but the cat was still as wild as ever.
This was Darian, not the shell of a man whose mind was stuck somewhere else.