proboscis

pro·bos·cis

noun \prə-ˈbäs-əs, -kəs\

plural pro·bos·cis·es also pro·bos·ci·des \-ˈbäs-ə-ˌdēz\

Definition of PROBOSCIS

: any of various elongated or extensible tubular organs or processes especially of the oral region of an invertebrate: as a : a sucking organ of insects (as houseflies or mosquitoes) that is often also adapted for piercing b : one of the complex protrusible holdfasts on the scolex of certain tapeworms