haustellum
noun
haus·tel·lum hȯ-ˈste-ləm 
plural haustella hȯ-ˈste-lə
: a proboscis (as of an insect) adapted to suck blood or juices of plants
Word History
Etymology
New Latin, diminutive of Latin haustrum scoop on a waterwheel, from haurire to drink, draw — more at exhaust
First Known Use
1816, in the meaning defined above