fibrilliform,a.|faɪˈbrɪlɪfɔːm| [f. fibrilla + -iform.] Having the form of a fibril or fibrils. 1847–9Todd Cycl.Anat. IV. 398/1 The fibrilliform fronds of the fresh-water algæ.1870Bentley Bot. 37 Inextricably interwoven..so as to form a loose fibrilliform tissue.