Definition of parenthetical adjective from the Oxford Advanced Learner's Dictionary

 

parenthetical

 adjective
adjective
BrE BrE//ˌpærənˈθetɪkl//
 
; NAmE NAmE//ˌpærənˈθetɪkl//
 
(also parenthetic
BrE BrE//ˌpærənˈθetɪk//
 
; NAmE NAmE//ˌpærənˈθetɪk//
 
)
[usually before noun](formal)
 
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given as extra information in a speech or piece of writing parenthetical remarks Word Origin late 18th cent.: from parenthesis, on the pattern of pairs such as synthesis, synthetic.
See the Oxford Advanced American Dictionary entry: parenthetical