The Collaborative International Dictionary
Sesquipedal
Sesquipedal \Ses*quip"e*dal\, Sesquipedalian \Ses`qui*pe*da"li*an\, a. [Sesqui- + pedal: cf. F. sesquip['e]dal, L. sesquipedalis.] Measuring or containing a foot and a half; as, a sesquipedalian pygmy; -- sometimes humorously applied to long words.
Wiktionary
sesquipedal
a. Measuring or containing a foot and a half.