mar·gi·na·li·a
noun/ˌmɑːdʒɪˈneɪliə/
/ˌmɑːrdʒɪˈneɪliə/
[plural]- notes written in the margins of a book, etc.
（书等的）旁注，边注 - facts or details that are not very important
无足轻重的事情；细枝末节
Word Originmid 19th cent.: from medieval Latin, neuter plural of marginalis, from margo, margin- ‘edge’.