Word.ws English Dictionary

actinost

actinost noun: a bone at the base of a paired fin (of a fish).

Noun

actinost (plural actinosts)

  1. A bone at the base of a paired fin (of a fish)
    • The second well-developed actinost is below the vertebra supporting the subcaudal blood-vessels, but that is not so strong proximally as the first; the ribs are not directed downwards, but backwards, and are entirely separated from each other.1889, Dr. G. Baur, “On the morphology of ribs and the fate of the actinosts of the median fin in fishes”, in Journal of morphology, volume 3

Forms of actinost

pluralactinosts

Origin of actinost

From New Latin, from Ancient Greek ἀκτίς (aktís, “ray”) + ὀστέον (ostéon, “bone”).

Questions about actinost

What does actinost mean?
Actinost means a bone at the base of a paired fin (of a fish).
What part of speech is actinost?
Actinost is a noun.
What is the plural of actinost?
The plural of actinost is actinosts.

Words near actinost in the dictionary

  1. actinosporean
  2. actinosporeans
  3. actinospores
  4. actinosporin
  5. actinosporins
  6. actinost
  7. actinostele
  8. actinosteles
  9. actinostelic
  10. actinostolid
  11. actinostolids

Source and license

Adapted from Wiktionary: actinost (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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