Usually means: Fibrous structures in fish fins.
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We found 4 dictionaries that define the word actinotrichium:

General (4 matching dictionaries)
  1. actinotrichium: Merriam-Webster
  2. actinotrichium: Wordnik
  3. actinotrichium: Wiktionary
  4. actinotrichium: Merriam-Webster

Definitions from Wiktionary (actinotrichium)

noun:  (zoology) Any of a group of hairlike fibres in the finfolds of fish larvae that develop into fin rays

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