Webster's English Dictionary

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spicule

spic.ule \'spik-(.)yu:(*)l\ \.spik-yu.-'lif-(*-)r*s\ n [NL spicula & L 
   spiculum] : a minute slender pointed usu. hard body; esp : one of the 
   minute  calcareous or siliceous bodies that support the tissues of various 
   invertebrates - spic.u.lif.er.ous aj