luffa n 1: the dried fibrous part of the fruit of a plant of the genus Luffa; used as a washing sponge or strainer [syn: {loofa}, {loofah}, {luffa}, {loufah sponge}] 2: any of several tropical annual climbers having large yellow flowers and edible young fruits; grown commercially for the mature fruit's dried fibrous interior that is used as a sponge [syn: {luffa}, {dishcloth gourd}, {sponge gourd}, {rag gourd}, {strainer vine}]