Usually means: Supportive skeletal rays in echinoderms.
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We found 10 dictionaries that define the word actinost:

General (10 matching dictionaries)
  1. actinost: Merriam-Webster
  2. actinost: Wordnik
  3. actinost: Wiktionary
  4. Actinost: Dictionary.com
  5. Actinost: Online Plain Text English Dictionary
  6. actinost: Webster's Revised Unabridged, 1913 Edition
  7. Actinost: AllWords.com Multi-Lingual Dictionary
  8. actinost: FreeDictionary.org
  9. Actinost: TheFreeDictionary.com
  10. actinost: Merriam-Webster

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Definitions from Wiktionary (actinost)

▸ noun:  (ichthyology) A bone at the base of a paired fin (of a fish)

Similar:
actinophore, actinotrichium, actinopt, actinistian, actinopterygian, fishbone, finspine, bony fish, anal fin, actinopterian, more...

Opposite:
myostatin, myogenesis, myofibrillogenesis

Types:
echinoderm, cnidarian, mollusk, annelid, arthropod, nematode, rotifer, flatworm, more...

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Similar:
actinophore, actinotrichium, actinopt, actinistian, actinopterygian, fishbone, finspine, bony fish, anal fin, actinopterian, more...

Opposite:
myostatin, myogenesis, myofibrillogenesis

Types:
echinoderm, cnidarian, mollusk, annelid, arthropod, nematode, rotifer, flatworm, more...



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