Definition of haustellum in English:

haustellum

noun

Zoology
  • The sucking organ or proboscis of an insect or crustacean.

    • ‘Adult mouthparts are reduced, with mandibles essentially absent, but the maxillary and labial palps, and often the haustellum, are prominent.’
    • ‘The feeding structures of lice are complex, including the haustellum, a proboscis-like tube with teeth, which is used to pierce the host's skin.’
    • ‘It is about 4-5 cm long, and has a kind of ‘hook’ at the head, which is where the moth's tongue, or haustella, is formed.’

Origin

Early 19th century: modern Latin diminutive of haustrum scoop, from haust- drawn in, from the verb haurire.

Pronunciation:

haustellum

/hɔːˈstɛləm/