Source : Webster's Revised Unabridged Dictionary (1913)

Haustellum \Haus*tel"lum\, n.; pl. {Haustella}. [NL.] (Zo["o]l.)
   The sucking proboscis of various insects. See {Lepidoptera},
   and {Diptera}.

Source : WordNet®

haustella
     See {haustellum}