Acicular may refer to
* In botany: a slender
leaf shape
The following terms are used to describe leaf morphology in the description and taxonomy of plants. Leaves may be simple (that is, the leaf blade or 'lamina' is undivided) or compound (that is, the leaf blade is divided into two or more leaflets ...
* In mineralogy:
Acicular (crystal habit)
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Acicular, in mineralogy, refers to a crystal habit composed of slender, needle-like crystals. Crystals with this habit tend to be fragile. Complete, undamaged acicular specimens are uncommon.
The term "acicular" derives from the Late ...
refers to a needle-like crystal form
*
Acicular ferrite
Acicular ferrite is a microstructure of ferrite in steel that is characterised by needle-shaped crystallites or grains when viewed in two dimensions. The grains, actually three-dimensional in shape, have a thin lenticular shape. This microstruct ...
, a microstructure of ferrite in steel
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