Definitions

1. adjective

relating to or characterized by fibrils or fibres, especially in a branching or thread-like manner

“The pathologist observed fibrillary structures under the microscope.”

2. noun

a fibril or fibre, especially one that is branching or thread-like

“The fibrillary formations in the brain tissue were a sign of the disease.”

3. adverb

in a fibrillary manner

“The fibrillary growth of the bacteria was visible to the naked eye.”