Definition of parenthetical adjective from the Oxford Advanced American Dictionary

 

parenthetical

 adjective
adjective
NAmE//ˌpærənˈθɛt̮ɪkl//
 
(also parenthetic
NAmE//ˌpærənˈθɛt̮ɪk//
 
)
[usually before noun](formal)
 
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given as extra information in a speech or piece of writing parenthetical remarks
parenthetically
 
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NAmE//ˌpærənˈθɛt̮ɪkli//
 
adverb
See the Oxford Advanced Learner's Dictionary entry: parenthetical