Definitions from Wiktionary (spicule)

▸ noun:  A sharp, needle-like piece.
▸ noun:  A tiny glass flake formed during the manufacture of glass vials
▸ noun:  (biology) Any of many needle-like crystalline structures that provide skeletal support in marine invertebrates like sponges.
▸ noun:  A needle-like mating structure found only in male nematodes.
▸ noun:  (astronomy) A jet of matter ejected from the photosphere of the sun.
▸ noun:  A small spike of flowers.
▸ Also see spicule


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