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