Definitions from Wiktionary (spiculum)

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



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