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n. pl. a·cic·u·lae (-lē′)
A slender, needlelike part or structure, such as a spine or bristle of certain plants and animals or a crystal of certain minerals.

[Latin, hairpin, diminutive of acus, needle; see ak- in Indo-European roots.]

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


n, pl -lae (-ˌliː)
a needle-shaped part, such as a spine, prickle, or crystal
[C19: New Latin, diminutive of acus needle]
aˈcicular adj


(əˈsɪk yə lə)

n., pl. -lae (-ˌli)
a needlelike part; spine, bristle, or needlelike crystal.
[1875–80; < New Latin, Late Latin, alter. of acucula ornamental pin = Latin acu-, s. of acus needle (compare acute) + -cula -cule1]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.acicula - a needlelike part or structure of a plant or animal or crystalacicula - a needlelike part or structure of a plant or animal or crystal; as a spine or bristle or crystal
part, piece - a portion of a natural object; "they analyzed the river into three parts"; "he needed a piece of granite"


A sharp or tapered end:
References in periodicals archive ?
Notopodia conical with 1-2 small aciculae in subsequent segments, bearing many long simple and few serrate chaetae.
In high alloy diffusion zone at the seam-JS26 alloy interphase boundary at temperature of ageing in solid solution, carbides of [Me.sub.6]C type have formed in the form of plates (aciculae) in the places enriched with tungsten.
Then come more eccentricities: tiny crumbs of rare species lost amid yellowing layers and more layers of cotton nesting; odd-looking powders and flakes and sands and aciculae in assortments of vials and pipettes and miniature paper boxes; labels proposing straight-faced such species and/or varietal names as might have bemused Agricola.