Definition of siphuncle in English:

siphuncle

noun ˈsʌɪfʌŋk(ə)lˈsaɪˌfəŋk(ə)l

Zoology

(in shelled cephalopods such as nautiloids and ammonoids) a calcareous tube containing living tissue running through all the shell chambers, serving to pump fluid out of vacant chambers in order to adjust buoyancy.
Example sentencesExamples
- Outwardly indistinguishable from other ammonoids, clymeniids are distinguished internally by their dorsal siphuncle, contrasted to a ventral siphuncle in almost all other ammonoids.
- As shown above, a dorsal siphuncle is about 50% smaller than a ventral siphuncle of the same diameter.
- The higher the value, the nearer the siphuncle is toward the concave side of the conch.
- The dorsal siphuncles of the Clymeniida tend to be larger than the ventral siphuncles of other ammonoid clades.
- Given that the shell that covers the siphuncle is its only permeable surface, the interchange of fluids can take place only through this structure.

Origin

Mid 18th century: from Latin siphunculus 'small tube'.

Definition of siphuncle in US English:

siphuncle

nounˈsīˌfəNGk(ə)lˈsaɪˌfəŋk(ə)l

Zoology

(in shelled cephalopods such as nautiloids and ammonoids) a calcareous tube containing living tissue running through all the shell chambers, serving to pump fluid out of vacant chambers in order to adjust buoyancy.
Example sentencesExamples
- The higher the value, the nearer the siphuncle is toward the concave side of the conch.
- The dorsal siphuncles of the Clymeniida tend to be larger than the ventral siphuncles of other ammonoid clades.
- As shown above, a dorsal siphuncle is about 50% smaller than a ventral siphuncle of the same diameter.
- Given that the shell that covers the siphuncle is its only permeable surface, the interchange of fluids can take place only through this structure.
- Outwardly indistinguishable from other ammonoids, clymeniids are distinguished internally by their dorsal siphuncle, contrasted to a ventral siphuncle in almost all other ammonoids.

Origin

Mid 18th century: from Latin siphunculus ‘small tube’.

单词	siphuncle
释义	Definition of siphuncle in English: siphuncle noun ˈsʌɪfʌŋk(ə)lˈsaɪˌfəŋk(ə)l Zoology (in shelled cephalopods such as nautiloids and ammonoids) a calcareous tube containing living tissue running through all the shell chambers, serving to pump fluid out of vacant chambers in order to adjust buoyancy. Example sentencesExamples Outwardly indistinguishable from other ammonoids, clymeniids are distinguished internally by their dorsal siphuncle, contrasted to a ventral siphuncle in almost all other ammonoids. As shown above, a dorsal siphuncle is about 50% smaller than a ventral siphuncle of the same diameter. The higher the value, the nearer the siphuncle is toward the concave side of the conch. The dorsal siphuncles of the Clymeniida tend to be larger than the ventral siphuncles of other ammonoid clades. Given that the shell that covers the siphuncle is its only permeable surface, the interchange of fluids can take place only through this structure. Origin Mid 18th century: from Latin siphunculus 'small tube'. Definition of siphuncle in US English: siphuncle nounˈsīˌfəNGk(ə)lˈsaɪˌfəŋk(ə)l Zoology (in shelled cephalopods such as nautiloids and ammonoids) a calcareous tube containing living tissue running through all the shell chambers, serving to pump fluid out of vacant chambers in order to adjust buoyancy. Example sentencesExamples The higher the value, the nearer the siphuncle is toward the concave side of the conch. The dorsal siphuncles of the Clymeniida tend to be larger than the ventral siphuncles of other ammonoid clades. As shown above, a dorsal siphuncle is about 50% smaller than a ventral siphuncle of the same diameter. Given that the shell that covers the siphuncle is its only permeable surface, the interchange of fluids can take place only through this structure. Outwardly indistinguishable from other ammonoids, clymeniids are distinguished internally by their dorsal siphuncle, contrasted to a ventral siphuncle in almost all other ammonoids. Origin Mid 18th century: from Latin siphunculus ‘small tube’.
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