14 letters · 26 points in Scrabble
noun a very long word (a foot and a half long)
adjective given to the overuse of long words
adjective (of words) long and ponderous; having many syllables
originFrom sesquipedal + -ian (adjective- and noun-forming suffix), root from Latin sēsquipedālis (literally “a foot and a half long”), from Latin sēsqui (“one and a half times”) + Latin pedālis (“measuring a foot, foot (relational)”) (an adjective from pēs (“foot”)).
Etymology from Wiktionary, CC BY-SA 3.0