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Webster's 1913 Dictionary

SIPHUNCLE

Si "phun `cle, n. Etym: [L. siphunculus, sipunculus, dim. of sipho. See Siphon. ] (Zoöl.)

Defn: The tube which runs through the partitions of chambered cephalopod shells.

SIPHUNCLED

SIPHUNCLED Si "phun `cled, a. (Zoöl.)

Defn: Having a siphuncle; siphunculated.

New American Oxford Dictionary

siphuncle

si phun cle |ˈsīfəNGkəl ˈsaɪˌfəŋkəl | ▶noun 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. ORIGIN mid 18th cent.: from Latin siphunculus ‘small tube. ’

Oxford Dictionary

siphuncle

siphuncle |ˈsʌɪfʌŋk (ə )l | ▶noun 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. ORIGIN mid 18th cent.: from Latin siphunculus ‘small tube ’.