cro·sti·no 
(krō-stēnō)
(krō-stēnō)n. pl. cros·ti·ni (-nē)
1. A piece of thin crisp toast.
2. An hors d'oeuvre made with a crostino and any of various toppings.
[Italian, diminutive of crosta, crust, from Latin crusta; see kreus- in the Appendix of Indo-European roots.]