Definitions

from The Century Dictionary.

  • noun The predecessor of the protosiphon in the Ammonites, consisting of a kind of ligament united to the wall of the initial chamber, or protoconch.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Zoöl.) A minute tube found in the protoconch of ammonites, and not connected with the true siphon.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun zoology A minute tube found in the protoconch of ammonites, not connected with the true siphon.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

pro- +‎ siphon

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Examples

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