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[suhb-shel] /ˈsʌbˌʃɛl/
noun, Physics.
a group of electrons in an atom belonging to the same shell and also having the same azimuthal quantum number.
Origin of subshell
First recorded in 1965-70; sub- + shell Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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subshell in Science
One or more orbitals in the electron shell of an atom with the same energy level. Subshells have different shapes and are distinguished by their magnetic quantum number. See more at orbital, quantum number.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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