prosiphonate
/prəʊˈsʌɪf(ə)neɪt/ /prəʊˈsʌɪf(ə)nət/Palaeontology
adjective
Of a chambered shell: having the septal necks of the siphuncle directed forward, as in some ammonoids.
Origin
1930s; earliest use found in William Twenhofel (1875–1957). From pro- + siphonate.
- M and B
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