sub class

subclass

[suhb-klas, -klahs]
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:
1810–20; sub- + class

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Collins
World English Dictionary
subclass (ˈsʌbˌklɑːs)
 
n
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
 
vb
4.  (tr) to assign to a subclass

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
subclass   (sŭb'klās')  Pronunciation Key 
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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