actinost
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English[edit]
Etymology[edit]
From New Latin, from Ancient Greek ἀκτίς (aktís, “ray”) + ὀστέον (ostéon, “bone”).
Noun[edit]
actinost (plural actinosts)
- (ichthyology) A bone at the base of a paired fin (of a fish)
- 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[1], volume 3:
- 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.