shell (shl) n. 1. a. The usually hard outer covering that encases certain organisms, such as mollusks, insects, and turtles; the carapace. b. A similar outer covering on an egg, fruit, or nut. c. The material that constitutes such a covering. 2. Something resembling or having the form of a shell, especially: a. An external, usually hard, protective or enclosing case or cover. b. A framework or exterior, as of a building. c. A thin layer of pastry. d. The external part of the ear. 3. Nautical a. The hull of a ship. b. A light, long, narrow racing boat propelled by rowers. 4. A small glass for beer. 5. a. An artillery projectile containing an explosive charge. b. A metal or cardboard case containing the charge and primer for a piece of firearms ammunition, especially one also containing shot and fired from a shotgun. 6. An attitude or a manner adopted to mask one's true feelings or to protect one from perceived or real danger. 7. Physics a. Any of the set of hypothetical spherical surfaces centered on the nucleus of an atom that contain the orbitals of electrons having the same principal quantum number. b. An analogous pattern of protons and neutrons within a nucleus. 8. a. A usually sleeveless and collarless, typically knit blouse, often worn under another top. b. The outermost layer of a lined garment such as a coat or jacket: a parka with a waterproof shell. 9. Computer Science A program that works with the operating system as a command processor, used to enter commands and initiate their execution. 10. A company or corporation with few or no assets or independent operations that is acquired by another company in order to allow the acquiring company to conduct business under the acquired company's legitimate legal standing. v. shelled, shell·ing, shells v.tr. 1. a. To remove the shell of; shuck: shell oysters. b. To remove from a shell: shell peas. 2. To separate the kernels of (corn) from the cob. 3. To fire shells at; bombard. 4. a. To defeat decisively. b. Baseball To hit the pitches of (a pitcher) hard and with regularity: shelled the pitcher for eight runs in the first inning. v.intr. Phrasal Verb: 1. To shed or become free of a shell. 2. To look for or collect shells, as on a seashore: spent the day shelling on Cape Cod. shell out Informal To hand over; pay: had to shell out $500 in car repairs. [Middle English, from Old English scell; see skel-1 in Indo-European roots.] shell adj. sheller n. |
The American Heritage® Dictionary of the English Language, Fourth Edition copyright ©2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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n
1. (Life Sciences & Allied Applications / Zoology) the protective calcareous or membranous outer layer of an egg, esp a bird's egg
2. (Life Sciences & Allied Applications / Zoology) the hard outer covering of many molluscs that is secreted by the mantle
3. (Life Sciences & Allied Applications / Zoology) any other hard outer layer, such as the exoskeleton of many arthropods
4. (Life Sciences & Allied Applications / Botany) the hard outer layer of some fruits, esp of nuts
5. any hard outer case
6. (Military / Firearms, Gunnery, Ordnance & Artillery) a hollow artillery projectile filled with explosive primed to explode either during flight, on impact, or after penetration Compare ball1 [7a]
7. (Military / Firearms, Gunnery, Ordnance & Artillery) a small-arms cartridge comprising a hollow casing inside which is the primer, charge, and bullet
8. (Military / Firearms, Gunnery, Ordnance & Artillery) a pyrotechnic cartridge designed to explode in the air
9. (Team Sports / Rowing) Rowing a very light narrow racing boat
10. (Miscellaneous Technologies / Building) the external structure of a building, esp one that is unfinished or one that has been gutted by fire
11. (Engineering / Mechanical Engineering) the basic structural case of something, such as a machine, vehicle, etc.
12. (Physics / Atomic Physics) Physics
a. 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
b. an analogous energy state of nucleons in certain theories (shell models) of the structure of the atomic nucleus
13. (Cookery) the pastry case of a pie, flan, etc.
14. (Miscellaneous Technologies / Building) a thin slab of concrete or a skeletal framework made of wood or metal that forms a shell-like roof
15. (Social Science / Education) Brit (in some schools) a class or form
come (or bring) out of one's shell to become (or help to become) less shy and reserved
vb
1. to divest or be divested of a shell, husk, pod, etc.
2. to separate or be separated from an ear, husk, cob, etc.
3. (Military / Firearms, Gunnery, Ordnance & Artillery) (tr) to bombard with artillery shells See also shell out
[Old English sciell; related to Old Norse skel shell, Gothic skalja tile, Middle Low German schelle shell; see scale1, shale]
shell-less adj
shell-like adj
shelly adj
Collins English Dictionary – Complete and Unabridged © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003
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