spiculum

  1. Noun.  A thrusting javelin used by Romans that replaced the pilum in the late 3rd century. .
  2. Noun.  A sharp, pointed crystal, especially of ice.
  3. Noun.  (zoology) A sharp, needle-like structure, especially those making up the skeleton of a sponge.
  4. Noun.  (astronomy) A small radial emission of gas seen in the chromosphere and corona of the sun.

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This entry was last updated on RefTopia from its source on 3/20/2012.