piddock

[pid-uhk]
noun
any bivalve mollusk of the genus Pholas or the family Pholadidae, having long, ovate shells and burrowing in soft rock, wood, etc.

Origin:
1850–55; perhaps akin to Old English puduc wart

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World English Dictionary
piddock (ˈpɪdək)
 
n
See also shipworm any marine bivalve of the family Pholadidae, boring into rock, clay, or wood by means of sawlike shell valves
 
[C19: origin uncertain]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

piddock

any of the marine bivalve mollusks of the family Pholadidae (Adesmoidea). Worldwide in distribution, they are especially adapted for boring into rock, shells, peat, hard clay, or mud. Most species occur in the intertidal zone, a few in deeper water.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Unlike the geoduck siphon, which has a leathery feel, the piddock siphon feels slippery and slimy.
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