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1.
An acronym contained within an acronym.
Example 1: USB is an acronym for "Universal Serial Bus." Bus is an acronym for "Bidirectional universal switch." Bus is a parsonym of USB. (Computer and Information Science)

Example 2: THIS is an acronym for "Tanzania HIV Indicator Survey." HIV is an acronym for "Human Immunodeficiency Virus." HIV is a parsonym of THIS. (Science and Medicine)

Example 3: TAPS is an acronym for "TERCOM Aircraft Positioning System." TERCOM is an acronym for "Terrain Comparison." TERCOM is a parsonym of TAPS. (Military and Government)

"Yeah, and then he says to me, 'Did you notice that "Bus" is a parsonym of USB?'" "Like I give a f***." "What a flake."
by dreadsocks November 17, 2007
 
2.
An acronym contained within an acronym.
In electronics parlance, USB is an acronym for Universal Serial Bus. Bus is an acronym for Bidirectional universal switch. In this instance, Bus is a parsonym of USB.
by Dreadsocks November 17, 2007