noun Zoology.
the stalk or peduncle upon which the eye is borne in lobsters, shrimps, etc.

1850–55; eye + stalk1

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World English Dictionary
eyestalk (ˈaɪˌstɔːk)
a movable stalk bearing a compound eye at its tip: occurs in crustaceans and some molluscs

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
eyestalk   (ī'stôk')  Pronunciation Key 
A movable stalk having a compound eye on its tip, found on crabs, lobsters, and other crustaceans.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
To get better maturation effect, unilateral eyestalk ablation is desirable.
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