Haustellum

from The Collaborative International Dictionary of English v.0.48

Haustellum \Haus*tel"lum\ (h[add]s*t[e^]l"l[u^]m), n.; pl.
   {Haustella} (-l[.a]). [NL.] (Zool.)
   The sucking proboscis of various insects. See {Lepidoptera},
   and {Diptera}.
   [1913 Webster]