| 单词 | pinnulus | 
| 释义 | † pinnulusn. Zoology. Obsolete. rare.   A type of sponge spicule in which one ray has a series of short spines along its length, arranged pinnately. ΚΠ 1887    W. J. Sollas in  Encycl. Brit. XXII. 417/1  				The suppression of the proximal ray and the development of spines projecting forwards on the distal ray produce the pinnulus. This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2020). < | 
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