aciculum

 [uh-sik-yuh-luhm]  

a·cic·u·lum

   [uh-sik-yuh-luhm]
noun, plural a·cic·u·lums, a·cic·u·la  [-luh] .
1.
an acicula.
2.
Zoology. one of the slender, sharp stylets embedded in the parapodia of certain annelid worms, as the polychaetes.
Origin:
alteration of acicula
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Aciculum is always a great word to know.
So is arthropoda. Does it mean:
phylum comprised of arthropods
invertebrate phylum with characteristic stinging structures
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Collins
World English Dictionary
aciculum (əˈsɪkjʊləm)
 
—n , pl -lums, -la
a needle-like bristle that provides internal support for the appendages (chaetae) of some polychaete worms
 
[C19: New Latin; see acicula]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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