What does periostracum mean?
Definitions for periostracum
pe·rios·tracum
This dictionary definitions page includes all the possible meanings, example usage and translations of the word periostracum.
Wiktionary
periostracumnoun
The proteinaceous outer sheath of many molluscan shells.
Wikipedia
Periostracum
The periostracum ( PERR-ee-OS-trə-kəm) is a thin, organic coating (or "skin") that is the outermost layer of the shell of many shelled animals, including molluscs and brachiopods. Among molluscs, it is primarily seen in snails and clams, i.e. in gastropods and bivalves, but it is also found in cephalopods such as Allonautilus scrobiculatus. The periostracum is an integral part of the shell, and it forms as the shell forms, along with the other shell layers. The periostracum is used to protect the organism from corrosion. The periostracum is visible as the outer layer of the shell of many molluscan species from terrestrial, freshwater, and marine habitats, and may be seen in land snails, river mussels, and other kinds of freshwater bivalves, as well as in many kinds of marine shelled molluscs. The word periostracum means "around the shell", meaning that the periostracum is wrapped around what is usually the more calcareous part of the shell. Technically, the calcareous part of the shell can (at least in theory) be referred to as the "ostracum", but that term is only very rarely used.
Webster Dictionary
Periostracumnoun
a chitinous membrane covering the exterior of many shells; -- called also epidermis
Etymology: [NL., fr. Gr. peri` around + shell of a testacean.]
Wikidata
Periostracum
The periostracum is a thin organic coating or "skin" which is the outermost layer of the shell of many shelled animals, including molluscs and brachiopods. Among mollusks it is primarily seen in snails and clams, i.e. in bivalves and gastropods, but it is also found in cephalopods such as Allonautilus scrobiculatus. Periostracum is an integral part of the shell, and it forms as the shell forms, along with the other shell layers. Periostracum is visible as the outer layer of the shell of many molluscan species from terrestrial, freshwater and marine habitats, and may be seen in land snails, river mussels and other kinds of freshwater bivalves, as well as in many kinds of marine shelled mollusks. The word "periostracum" means "around the shell", meaning that the periostracum is wrapped around what is usually the more calcareous part of the shell. Technically the calcareous part of the shell can be referred to as the "ostracum", but that term is only very rarely used.
Numerology
Chaldean Numerology
The numerical value of periostracum in Chaldean Numerology is: 1
Pythagorean Numerology
The numerical value of periostracum in Pythagorean Numerology is: 5
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"periostracum." Definitions.net. STANDS4 LLC, 2024. Web. 23 Apr. 2024. <https://www.definitions.net/definition/periostracum>.
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