acicula

n., pl., -lae (-lē').
A slender, needlelike part or structure, such as the spines or bristles of some plants and animals and the crystals of certain minerals.

[Latin, hairpin, diminutive of acus, needle.]

aciculate a·cic'u·late (-lĭt, -lāt') or a·cic'u·lat'ed (-lā'tĭd) adj.

noun

A sharp or tapered end: acumination, apex, cusp, mucro, mucronation, point, tip. See sharp/dull.

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The noun has one meaning:

Meaning #1: a needle-like part or structure of a plant or animal or crystal; as a spine or bristle or crystal

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