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definition of the word spiculum

by the Wiktionnary

Modern Latin, an irregular diminutive of Latin spica ‘spike’.

Singular
spiculum

Plural
spicula

spiculum (plural spicula)

  1. A sharp, pointed crystal, especially of ice.
  2. (zoology) A sharp, needle-like structure, especially those making up the skeleton of a sponge.
  3. (astronomy) A small radial emission of gas seen in the chromosphere and corona of the sun.

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