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Periostracum
Noun
Word Frequency:
0.1
Definitions
1.
Noun
The proteinaceous outer sheath of many molluscan shells.
Synonyms
olivaceous
columella
peristome
prodissoconch
perisarc
omostegite
proostracum
peritreme
paraphragma
endostoma
perisoma
shell sac
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