- any of up to seven energy levels on which an electron may exist within an atom, the energies of the electrons on the same level being equal and on different levels being unequal.
- a group of nucleons of approximately the same energy.
- a scab on the surface of an ingot.
- a length of unfinished tubing.
- a pierced forging.
- a hollow object made by deep drawing.
verb (used with object)
verb (used without object)
Origin of shell
Examples from the Web for shells
The newest coach seats drop the upholstery and, instead, are shells molded to the human spine.Flying Coach Is the New Hell: How Airlines Engineer You Out of Room|Clive Irving|November 25, 2014|DAILY BEAST
An exuberant game of football takes place, then the sound of shells is heard, and both sides repair back to their enemy positions.How Monty The Penguin Won Christmas: Britain’s Epic, Emotional Commercials|Tim Teeman|November 16, 2014|DAILY BEAST
On Nov. 5, shells killed two children and wounded several people on a school playng field in Donetsk.
Eventually, Wurmser said, Sunni insurgent groups did gain access to the shells in 2005.Insiders Blame Rove for Covering Up Iraq’s Real WMD|Eli Lake|October 16, 2014|DAILY BEAST
As many as 5,000 shells fell into the center of town each day for nearly four weeks.Atlanta’s Fall Foretold The End Of Civil War Bloodshed|Marc Wortman|September 1, 2014|DAILY BEAST
Shells of this genus are often found grouped together in an inextricable mass.The Sea-beach at Ebb-tide|Augusta Foote Arnold
The feathers on their thighs are round like shells at the end, and being there very thick, have an agreeable effect.Extinct Birds|Walter Rothschild
Robinson put a couple of nuts in his hunting bag, and also the shells from the broken nuts.An American Robinson Crusoe|Samuel. B. Allison
They played in parties of two and two, with five shells each.Samoa, A Hundred Years Ago And Long Before|George Turner
I used to wonder how there was enough lead in the world to make all the shells the armies used.Over the Seas for Uncle Sam|Elaine Sterne
British Dictionary definitions for shells
- a class of electron orbits in an atom in which the electrons have the same principal quantum number and orbital angular momentum quantum number and differences in their energy are small compared with differences in energy between shells
- an analogous energy state of nucleons in certain theories (shell models) of the structure of the atomic nucleus
Word Origin for shell
Word Origin and History for shells (1 of 2)
Old English sciell, scill, Anglian scell "seashell, eggshell," related to Old English scealu "shell, husk," from Proto-Germanic *skaljo "piece cut off; shell; scale" (cf. West Frisian skyl "peel, rind," Middle Low German schelle "pod, rind, egg shell," Gothic skalja "tile"), with the shared notion of "covering that splits off," from PIE root *(s)kel- (1) "to cut, cleave" (cf. Old Church Slavonic skolika "shell," Russian skala "bark, rind;" see scale (n.1)). Italian scaglia "chip" is from Germanic.
Sense of "mere exterior" is from 1650s; that of "hollow framework" is from 1791. Meaning "structure for a band or orchestra" is attested from 1938. Military use (1640s) was first of hand grenades, in reference to the metal case in which the gunpowder and shot were mixed; the notion is of a "hollow object" filled with explosives. Hence shell shock, first recorded 1915. Shell game "a swindle" is from 1890, from a version of three-card monte played with a pea and walnut shells.
Word Origin and History for shells (1 of 2)
1560s, "to remove (a nut, etc.) from a shell," from shell (n.). The meaning "to bombard with shells" is first attested 1856. To shell out "disburse" (1801) is a figurative use from the image of extracting nuts. Related: Shelled; shelling.
Science definitions for shells
- The usually hard outer covering of certain animals, such as mollusks, insects, and turtles.
- The hard outer covering of a bird's egg.
- The hard outer covering of a seed, nut, or fruit.
- A set of electron orbitals that have nearly the same energy. Electrons in outer shells have greater energy than those in shells closer to the nucleus. Elements in the Periodic Table range from the lightest elements with electrons normally occupying one shell (hydrogen and helium) to the heaviest, with electrons in seven shells (radium and uranium, for instance). See more at atomic spectrum orbital subshell. See Note at metal.
- Any of the stable states of other particles or collections of particles (such as the nucleons in an atomic nucleus) at a given energy or small range of energies.
Idioms and Phrases with shells
In addition to the idiom beginning with shell
- shell out
- in one's shell