Usually, mouthparts. the appendages surrounding or associated with the mouth of arthropods.

1790–1800; mouth + part Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mouthpart (ˈmaʊθˌpɑːt)
any of the paired appendages in arthropods that surround the mouth and are specialized for feeding

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
mouthpart   (mouth'pärt')  Pronunciation Key 
Either of the appendages occurring in pairs in insects and other arthropods that extend from the head and are used for feeding.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Pull gently and carefully in a steady upward motion at the point where the tick's mouthpart enters the skin.
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