periostracum
periostracum · periostraca · periostracums
The proteinaceous outer sheath of many molluscan shellsThe proteinaceous outer sheath of many molluscan shells.
Meaning
1 sensesThe proteinaceous outer sheath of many molluscan shells.
Origin
Literally "surrounding shell", from peri- + ostracum.Literally "surrounding shell", from peri- + ostracum.
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Forms
plural: periostraca / periostracums| Singular | periostracum |
|---|---|
| Plural | periostraca / periostracums |
regular
Word family
1 related wordsDerivedperiostracal
Lessons for this word
1 lessons- A1Plural nouns — Because its plural is irregular