haus·tel·lum 
(hô-stĕləm)
(hô-stĕləm)n. pl. haus·tel·la (hô-stĕlə)
A proboscis in certain insects that is used for sucking liquids.
[New Latin, diminutive of Latin haustrum, scoop on a water wheel, from haurīre, to draw up.]
haus·tellate (hô-stĕlĭt, hôstə-lāt′) adj.