fi·an·chet·to 
(f
ē′ən-k
ĕt
ō, -ch
ĕt
ō)
n. pl. fi·an·chet·ti (-k
ĕt
ē, -ch
ĕt
ē)
The development in chess of a bishop from its original position to the second square of the adjacent knight's file.
tr. & intr.v. fi·an·chet·toed,
fi·an·chet·to·ing,
fi·an·chet·tos To develop as or set up a fianchetto.
[Italian, diminutive of fianco, flank, from Old Italian, from Old French flanc; see FLANK.]