Having the form or shape of fibrils; resembling small threads or fibers in structure.
From Latin 'fibrilla' (small fiber) combined with '-form' (from Latin 'forma' meaning shape). The suffix '-form' means shaped like or resembling, creating descriptive terms for anatomical structures.
Fibrilliform structures appear everywhere in nature—from the delicate branches of coral polyps to the root systems of grasses—and this shape allows maximum surface area for absorption or gas exchange in a confined space.
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