noun

definition

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

example

pasta shells

definition

a light racing boat.

definition

an inner or roughly made coffin.

definition

the hand guard of a sword.

definition

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

example

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

definition

short for shell program.

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