spiny ray

noun

: a fin ray that is stiff, unbranched, pointed at the end, and lacking transverse segmentation, that occurs singly or grouped in the anterior part of the dorsal fin in many fishes or in the first dorsal when there are two as well as in the anal and ventral fins, and that was in former classifications the principal character of the group Acanthopterygii
opposed to soft ray

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“Spiny ray.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/spiny%20ray. Accessed 7 Dec. 2022.

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