sesquipedalian
/ˌseskwɪpɪˈdeɪlɪən/adjective
1- formal (of a word) polysyllabic; long〈正式〉（词）多音节的; 长的：
sesquipedalian surnames.
冗长的姓。
1.1
- characterized by long words; long-winded用长词的; 啰嗦的：
the sesquipedalian prose of scientific journals.
科学期刊好用长词的文体。
词源
mid 17th cent.: from Latin sesquipedalis 'a foot and a half long', from sesqui- （see SESQUI-）+pes, ped- 'foot'.