adj. Of or pertaining to fibrils, or nanoscale fibers
the GNU version of the Collaborative International Dictionary of English
adj. Of of pertaining to fibrils.
The Century Dictionary and Cyclopedia
Fibrillar.
Word Usage
"During surgery, Jack suffered a near-fatal stroke, but doctors were able to successfully remove 75-90 percent of the exposed tumor, an uncommon brain cancer called fibrillary astrocytoma, one of about 120 kinds of brain tumors."