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Having the shape of a needle: acicular crystals.


(əˈsɪk yə lər)

a•cic`u•lar′i•ty, n.
a•cic′u•lar•ly, adv.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.acicular - narrow and long and pointedacicular - narrow and long and pointed; as pine leaves
unsubdivided, simple - (botany) of leaf shapes; of leaves having no divisions or subdivisions


References in periodicals archive ?
Acicular crystals are rare in Cactoideae, and they occur in members of such Hylocereeae as Epiphyllum and Selenicereus (Mauseth et al.
Finely disseminated and acicular stratiform tourmaline within the Lower-Middle Aldridge contact (LMC) 150m and 600m west of the Talon Zone.
9a) contain acicular crystallites emanating in radial direction from the center (Fig.
2 mm long, 1- or 2-celled, erect, lax to acicular, adaxially glabrous or pubescent only toward the margins, eglandular, the hairs 0.
As shown by transmission electron micrographs, the crystals of original synthetic goethite were acicular, with particle sizes ranging from around 0.
7, revealed a greater presence of grain boundary ferrite (GBF) and acicular ferrite (AF) at the fusion zone in (b), (c) and (d).
4-5: "Underlying the basalt is a series of clastic sedimentary rocks ranging from coarse sandstone to shale and mudstone with intermittent gypsum bearing horizons and veins, beds, blebs and cavity fillings of acicular white sellenite.
1 show, the surface of black RHA was soft and round while the surface of white RHA was rough and had acicular shape.
The steel produced with this technology typically would have acicular ferrite (AF) and polygonal ferrite (PF) with dense dislocations, fine grain structure and dispersed martensite/austenite particles.
In addition to the main hardening phase, the diffusion zone of the basic brazing alloy shows the precipitation of acicular carbide phases of the [Me.
1 mm thick near the base, thinly coriaceous mainly toward the base, suberect-arcuate, slightly channeled, dark green to slightly bronze colored, abaxially densely and coarsely white-lepidote with trichomes obscuring the color of the blade, finely nerved, adaxially subdensely white lepidote only at the base and glabrous toward the apex, apex long attenuate-caudate; margins laxly spinose, spines narrowly triangular, acicular and pale castaneous toward the apex, 0.
Hypoeutectic cast Al-Si alloys are highly susceptible to occurrence of the sharp edges of the coarse acicular silicon phase that promote crack initiation, and propagation in alloys and also the porosity formation