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Pentacrinus +‎ -in


pentacrinin (uncountable)

  1. (organic chemistry) A red and purple pigment found in certain crinoids of the genus Pentacrinus.

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 The imported definitions may be significantly out of date, and any more recent senses may be completely missing.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 pentacrinin in
Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.)