noun
a small, needle-like structure or crystal found in various organisms such as sponges or echinoderms
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The scientist observed the spicule under the microscope to study its structure.
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I think I found a tiny spicule in the sand while walking on the beach.
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Be careful not to step on those spicules, they can hurt your feet!
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His sharp words were like spicules, piercing through her heart.