Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A portion of the proboscis that is adapted as a sucking organ in many insects.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A sucking organ, in the form of a proboscis, in many insects and crustaceans

from the GNU version of the Collaborative International Dictionary of English

  • n. The sucking proboscis of various insects. See lepidoptera, and diptera.

from The Century Dictionary and Cyclopedia

  • n. The sucking-organ of an insect or a crustacean; a suctorial proboscis.

Etymologies

New Latin, diminutive of Latin haustrum, scoop on a water wheel, from haurīre, to draw up.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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