loofa

or loo·fah (lo͞oˈfə) also luf·fa (lo͞oˈfə, lŭfˈə)

1. Any of several Old World tropical vines of the genus Luffa, having cylindrical fruit with a fibrous, spongelike interior.
2. The dried, fibrous part of the loofa fruit, used as a washing sponge or as a filter. Also called dishcloth gourd, vegetable sponge.