spike shell

from The Collaborative International Dictionary of English v.0.48
Spike \Spike\, n. [Akin to LG. spiker, spieker, a large nail, D.
   spijker, Sw. spik, Dan. spiger, Icel. sp[imac]k; all perhaps
   from L. spica a point, an ear of grain; but in the sense of
   nail more likely akin to E. spoke of a wheel. Cf. {Spine}.]
   1. A sort of very large nail; also, a piece of pointed iron
      set with points upward or outward.
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   2. Anything resembling such a nail in shape.
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            He wears on his head the corona radiata . . .; the
            spikes that shoot out represent the rays of the sun.
                                                  --Addison.
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   3. An ear of corn or grain.
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   4. (Bot.) A kind of flower cluster in which sessile flowers
      are arranged on an unbranched elongated axis.
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   {Spike grass} (Bot.), either of two tall perennial American
      grasses ({Uniola paniculata}, and {Uniola latifolia})
      having broad leaves and large flattened spikelets.

   {Spike rush}. (Bot.) See under {Rush}.

   {Spike shell} (Zool.), any pteropod of the genus {Styliola}
      having a slender conical shell.

   {Spike team}, three horses, or a horse and a yoke of oxen,
      harnessed together, a horse leading the oxen or the span.
      [U.S.]
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