Usually means: Star-shaped spicules in some sponges.
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We found 5 dictionaries that define the word spiraster:

General (4 matching dictionaries)
  1. spiraster: Merriam-Webster
  2. spiraster: Collins English Dictionary
  3. spiraster: Wordnik
  4. spiraster: Wiktionary

Computing (1 matching dictionary)
  1. spiraster: Encyclopedia

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Definitions from Wiktionary (spiraster)

▸ noun:  (zoology) In sponges, a short curved axial rod-like spicule with thick spines.

Similar:
sterraster, streptaster, spiculum, acanthostyle, sceptrule, spicule, rhabd, oxea, spicula, dendroclone, more...

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Similar:
sterraster, streptaster, spiculum, acanthostyle, sceptrule, spicule, rhabd, oxea, spicula, dendroclone, more...



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