a subordinate type.
a special type included within a more general type.

1860–65; sub- + type

subtypical [suhb-tip-i-kuhl] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
subtype (ˈsʌbˌtaɪp)
a secondary or subordinate type or genre, esp a specific one considered as falling under a general classification

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Computing Dictionary

subtype definition

If S is a subtype of T then an expression of type S may be used anywhere that one of type T can and an implicit type conversion will be applied to convert it to type T.
In object oriented programming, this means that objects of type S must accept every message that one of type T would.
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
There will, it is true, be more drugs to prescribe as each subtype of each
  common disease gets its own private magic bullet.
For every type or subtype, scientists would need to discover another set of
  molecular markers.
And, yes, out the nose is a subtype of the spit take.
The paper also describes for the first time a particularly aggressive subtype
  of the disease.
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