- (of cast iron) containing ferrite in a needlelike form.
- (of an alloy) having a microstructure of needlelike components.
Examples from the Web for acicular
Acicular, as-ik′ū-lar, adj. needle-shaped; slender and sharp-pointed.
Valve very narrow, lanceolate, acicular, with obtuse apices.The Diatomaceae of Philadelphia and Vicinity|Charles Sumner Boyer
Soon Birdie and myself were a mass of acicular crystals; it was a true easterly fog.Celebrated Women Travellers of the Nineteenth Century|W. H. Davenport Adams
Spores of Bacidia fuscorubella to illustrate the several-celled, hyaline, acicular type.Ohio Biological Survey, Bull. 10, Vol. 11, No. 6|Bruce Fink and Leafy J. Corrington
Crystals are prismatic, acicular or scaly in habit; they have a perfect cleavage parallel to the brachypinacoid (M in the figure).