adj. Needle-shaped; slender like a needle or bristle.
adj. Having sharp points like needles.
the GNU version of the Collaborative International Dictionary of English
adj. Needle-shaped; slender like a needle or bristle, as some leaves or crystals; also, having sharp points like needles.
The Century Dictionary and Cyclopedia
Having the shape of a slender needle or stout bristle; having a sharp point like a needle: as, an acicular prism, like those of stibnite; an acicular bill, as that of a humming-bird. Other forms are aciculate, aciculated, aciculiform, and aciculine.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. narrow and long and pointed; as pine leaves
Word Usage
"Soon Birdie and myself were a mass of acicular crystals; it was a true easterly fog."