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pro- +‎ siphon


prosiphon (plural prosiphons)

  1. (zoology) A minute tube found in the protoconch of ammonites, not connected with the true siphon.

Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for prosiphon in
Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.)