Enter a clue or pattern or both:
The Clue
Shells of shells (7 letter answer)
The Answer
CASINGS
Tags
Notes
The answer CASINGS is so rare that it appears less than once every 2900 puzzles.
Related Clues
Doorframes
Sheaths
Enclosing frames
Definition
CASING as a noun:
1. (shell, case, casing) = the housing or outer covering of something; "the clock has a walnut case"
2. the outermost covering of a pneumatic tire
3. (casing, case) = the enclosing frame around a door or window opening; "the casings had rotted away and had to be replaced"