sesquipedalian

 
Pronunciation: /ˌsɛskwɪpɪˈdeɪlɪən/

adjective

formal
  • (of a word) polysyllabic; long: sesquipedalian surnames
  • characterized by long words; long-winded: the sesquipedalian prose of scientific journals

Origin:

mid 17th century: from Latin sesquipedalis 'a foot and a half long', from sesqui- (see sesqui-) + pes, ped- 'foot'