adjective
relating to or resembling a needle or needles in shape; slender and pointed
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The acicular crystals in the mineral sample were carefully studied under a microscope.
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The sharp acicular shape of the cactus needles can be quite painful if touched.
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I accidentally pricked myself on an acicular thorn while gardening.
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Her words were like acicular daggers, piercing through his heart with their sharpness.