a. [f. FIBRILLA + -(I)FORM.] Having the form of a fibril or fibrils.
1847–9. R. B. Todd, The Cyclopædia of Anatomy and Physiology, IV. 398/1. The fibrilliform fronds of the fresh-water algæ.
1870. Bentley, Bot., 37. Inextricably interwoven … so as to form a loose fibrilliform tissue.
