Having fibrils or being composed of small thread-like structures; marked by the presence of fine fibers.
From 'fibril' (small fiber) with the adjective suffix '-ed'. Used in anatomy and biology to describe structures that have a fibrous or thread-like composition.
Plant roots are deeply fibrilled with root hairs that look like tiny threads under a microscope, and these structures are so fine that they can fit into microscopic soil pores to absorb water and nutrients.
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