/haw stel"euhm/ , n. , pl. haustella /haw stel"euh/ .
(in certain crustaceans and insects) an organ or part of the proboscis adapted for sucking blood or plant juices.
[ 1810-20; haustrum scoop on a water wheel, equiv. to haus-, var. s. of haurire to scoop up, draw + -trum suffix of instrument; for formation, see CASTELLUM ]