spicula
  針狀體,骨針
  Spic·u·la n.; pl. Spiculae   Bot. (a) A little spike; a spikelet. (b) A pointed fleshy appendage.
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  Spic·u·lum n.; pl. Spicula   Zool. Same as Spicule.
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  spiculum
       n : small pointed structure serving as a skeletal element in
           various marine and freshwater invertebrates e.g. sponges
           and corals [syn: spicule]
       [also: spicula (pl)]