Answer: spicule

AnswerCrossword Clue
SPICULESpikelet.
SPICULESkeletal support in a sponge
spiculejet of gas several hundred miles in diameter rising from the sun's surface to heights of 3000 to 6000 miles (4800 to 9600 km)
spiculeone of the small, hard, calcareous or siliceous bodies that serve as the skeletal elements of various marine and freshwater invertebrates
spiculea needlelike structure, also SPICULA, SPICULUM
spiculesmall or minute, slender, sharp-pointed body or part; small, needlelike crystal, process, or the like