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subclass

[suhb-klas, -klahs] /ˈsʌbˌklæs, -ˌklɑs/
noun
1.
a primary division of a class.
2.
a subordinate class, especially one of persons who lack the rights and privileges of the primary class:
a subclass of alien workers.
3.
Biology. a category of related orders within a class.
verb (used with object)
4.
to place in a subclass.
Origin
1810-1820
1810-20; sub- + class
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sub-class

subclass

/ˈsʌbˌklɑːs/
noun
1.
a principal subdivision of a class
2.
(biology) a taxonomic group that is a subdivision of a class
3.
(maths) another name for subset (sense 1)
verb
4.
(transitive) to assign to a subclass
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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sub-class in Medicine

subclass sub·class (sŭb'klās')
n.
A taxonomic category of ranking between a class and an order.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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sub-class in Science
subclass
  (sŭb'klās')   
A taxonomic category of related organisms ranking below a class and containing one or more orders.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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