the hard protective outer case of a mollusc or crustacean

cowrie shells

the technique of carving shell

an explosive artillery projectile or bomb

the sound of the shell passing over, followed by the explosion

shell holes

something resembling or likened to a shell because of its shape or its function as an outer case

pasta shells

baked pastry shells filled with cheese

the metal framework of a vehicle body

a light racing boat

an inner or roughly made coffin

the hand guard of a sword

each of a set of orbitals around the nucleus of an atom, occupied or able to be occupied by electrons of similar energies

in a multi-electron atom, the lowest energy shells fill up first

an electron descending from one shell to a lower one emits an X-ray

bombard with shells

several villages north of the security zone were shelled

remove the shell or pod from (a nut or seed)

they were shelling peas