actinost

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It's a recognised English word, but it isn't in the official NASPA Scrabble word list.

Definition of actinost

1 sense · 1 part of speech · etymology included

noun

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.”

Definitions from Wiktionary, CC BY-SA.

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

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